Awesome .NET

Framework that makes it easy to build HTTP services that reach a broad range of clients, including browsers and mobile devices

API framework enabling rich data access by using the OData 3 protocol. Client libraries available for JavaScript and C#.

Command Query Separation for 🌐ASP.NET Core ⚡AWS Lambda ⚡Azure Functions ⚡Google Cloud Functions 🌐ASP.NET Web API 2

High-performance middleground between classic ASP.NET Core API controllers and Minimal APIs. Using a REPR (Request-Endpoint-Response) pattern, this library eliminates the boilerplate and monolithic feel of controllers by improving colocation of code.

Mobius adds C# language binding to Apache Spark, enabling the implementation of Spark driver code and data processing operations in C#.

.NET core API Gateway

A .NET library allows clients to specify the exact fields they need, reducing unnecessary data transfer by avoiding the retrieval of all fields by default.

Thoughtfully architected, obscenely fast, thoroughly enjoyable web services for all

.NET Client for Telegram Bot API

A set of libraries and classes that simplify building REST APIs and gRPC services, reducing the amount of code to be written with even one line of code for a fully functional REST controller.

Automate a user account on Telegram, using the latest version of Telegram Client API

A convenient data structure supporting efficient in-memory indexing and querying, including range queries and fuzzy string matching.

Algorithm and data-structure library for .NET 3.5 and up. Algorithmia contains sophisticated algorithms and data-structures like graphs, priority queues, command, undo-redo and more.

OneOf provides discriminated unions for C# with exhaustive compile time matching.

data structures, algorithms, mathematics, metadata, extensions, console, measurements, and other useful stuff

.NET Core Extensions and Helper NuGet packages

The next generation of the ASP.NET Boilerplate web application framework.

Skip SignalR and gRPC. Build real-time Blazor and MAUI apps while writing just 0.1% of the usual real-time update code. Handle 10× more API requests with the ActualLab.Rpc protocol—or 1000× more with Fusion’s transparent and perfectly coherent caching. Samples. Documentation.

A starting point for new modern ASP.NET MVC web applications with best practices and most popular tools.

AspectCore Framework is an Aspect-Oriented Programming based cross platform framework for .NET Core and .NET Framework. Core support for aspect-interceptor,dependency injection integration , web applications , data validation , and more.

business layer development framework https://cslanet.com/

DotNetty is a port of Netty, asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients.

Open source ECMA CLI, C#, F#, VB and .NET implementation

Orleans is a framework that provides a straight-forward approach to building distributed high-scale computing applications, without the need to learn and apply complex concurrency or other scaling patterns

Peasy is a middle tier framework that offers an easy to use and flexible rules engine and was designed to address common challenges such as concurrency handling, transactional support, fault tolerance, threading, scalability, async and multiple client support, and easy testability, all without a huge learning curve!

Plastic provides encapsulation of things like Domain, Application Rules, Business Rules or Business Logic in Application. For this, Command pattern is used.

An advanced Web View (PositronWebView) with native JavaScript Context to access .NET APIs from hybrid applications inspired from capacitor/cordova.

The runtime repo contains the library implementation (formerly called "CoreFX") for .NET (5+). It includes System.Collections, System.IO, System.Xml and many other components.

Signals is a .NET5 based framework which focuses on increasing the quality and productivity within development teams by providing them with tools, aspects and processes.

The Silky framework is designed to help developers quickly build a microservice development framework through simple code and configuration under the .net platform.

Spring.NET is an open source application framework that makes building enterprise .NET applications easier

.NET project templates with batteries included, providing the minimum amount of code required to get you going faster.

backend: .NET Core, EF Core, C#; frontend: Babel, Webpack, React, CSS Modules

JHipster blueprint for replace orginal SpringBoot Backend by asp.net core. The main goal generator of jhipster is showcases best practices of modern web development in java. So the goal of the project is to do the same in .net. The Frontend can be generated with angular or react and soon with blazor. - NOTE: This is not affiliated with Microsoft or .NET

Vue startup application template that uses ASP.NET Core API layered architecture at the back-end and JWT based authentication

A prototypical .NET solution recommended by the F# Foundation---includes file system setup, Paket for dependencies and FAKE for build/test automation. By default, build process also compiles documentation and generates NuGet packages.

Serenity is an ASP.NET MVC application platform designed to simplify and shorten development of data-centric business applications with a service-based architecture. Serene is a starter template to build Serenity applications.

Large collection of useful templates for Web and Desktop development.

Windows 10 templates with design patterns.

C#/.NET Binding of llama.cpp, run LLaMA/GPT model using C# without having to compile lama.cpp.

One .NET library to consume OpenAI, Anthropic, Cohere, Google, Azure, Groq, and self-hosed APIs.

Extensible tool for weaving .NET assemblies.

Open-source alternative to ILMerge.

Cecil is a library to generate and inspect programs and libraries in the ECMA CIL form.

Modular extension for Microsoft ASP.NET Web Optimization Framework. Its modules supports LESS, Sass, CoffeeScript, TypeScript, Mustache, Handlebars, Autoprefixer along with a bunch of different JS and CSS minifiers.

A fully certified OpenID Connect server library for .NET by the OpenID Foundation, providing comprehensive support for OAuth2 and OpenID Connect across all profiles. [$][Free for non-commercial use]

New membership system for ASP.NET applications

SAML authentication support for ASP.NET apps

Write fine grained authorization policy in easy-to-read language, and have it compiled to native .NET code [$]

Helper library for identity & access control in .NET 4.5 and MVC4/Web API.

A F# Hawk authentication library

An IAM infrastructure for modern apps and SaaS products, supporting OIDC, OAuth 2.0 and SAML for authentication and authorization [$][Free for OSS]

Flexible and versatile OAuth 2.0/OpenID Connect stack for .NET

Add SAML 2P support to your Duende IdentityServer [$]

Add SAML 2P support to your OpenIddict [$]

A fine-grained authorization system with .NET SDK.

Fast, in-memory background job processing for .NET apps with configurable queues, timeouts, parallelism, and built-in OpenTelemetry support.

A set of enterprise-class UI components based on Ant Design and Blazor WebAssembly.

k8s management ui in blazor and .NET Core.

A set of enterprise-class UI components based on Bootstrap and Blazor. - NOTE: This is not affiliated with Microsoft or .NET

A set of enterprise-class UI components based on Material Design and Blazor WebAssembly.

Blazorise is a component library built on top of Blazor and CSS frameworks like Bootstrap, Bulma and Material. Very easy to use.

A Material Design framework for Blazor, allowing .NET developers to quickly build web apps, with extensive documentation and examples.

full Ethereum client in .NET Core

Cake (C# Make) is a cross-platform build automation system with a C# DSL.

F# Make, a cross-platform build automation system

A cross platform build and deployment automation system for building projects and executing deployment scripts using C# code. - NOTE: This is not affiliated with Microsoft or .NET

PowerShell build and test automation tool inspired by Psake.

Write your pipelines in C#

The Microsoft Build Engine (MSBuild) is the build platform for .NET and Visual Studio

Magic script-based C# task runner

Cross-platform build automation system

.NET-based build automation tool written in PowerShell

The open source report generator for .NET Core 2.x/.Net Framework 4.x. FastReport can be used in ASP.NET MVC, Web API applications.

in-memory data aggregation/OLAP library, pivot tables generation (render to HTML, exports), ASP.NET pivot builder control [$][Free for single-deployment/non-SaaS]

Declarative CLI argument & XML configuration parser for F# applications.

Declarative framework for building command line interfaces.

Wrapper for command line interfaces.

The Command Line Parser Library offers to CLR applications a clean and concise API for manipulating command-line arguments and related tasks

Model your console app using C# in a composable manner. Define commands with methods. Define subcommands with properties or nested classes. Extensible parsing and command execution.

This is a fork of Microsoft.Extensions.CommandLineUtils, which is no longer under active development.

Command-line interface description language that will make you smile.

Terminal UI toolkit for .NET.

PowerArgs converts command-line arguments into .NET objects that are easy to program against. It also provides a ton of optional capabilities such as argument validation, auto generated usage, tab completion, and plenty of extensibility

A simple netsh library for C#.

A library that makes it easier to create beautiful console applications.

A web CMS that focus on UX and adaptability

DNN Platform is our free, open source web CMS and the foundation of every professional DNN solution. Over 750,000 organizations worldwide have built websites powered by the DNN Platform.

RESTful CRUD (Create, Read, Update, Delete) APIs, Admin Panel web pages,a GraphQL-style query designer and a WYSIWYG web page designer, all fully configurable without writing code.

FluentCMS is open source AI Driven ASP.NET Core Blazor Content Management System (CMS)

MojoPortal is an extensible, cross database, mobile friendly, web content management system (CMS) and web application framework written in C# ASP.NET

Free, open source, community-focused project aimed at delivering applications and reusable components on the ASP.NET platform

Piranha is the fun, fast and lightweight .NET framework for developing cms-based web applications with an extra bite. It's built on ASP.NET MVC and Web Pages and is fully compatible with both Visual Studio and WebMatrix. https://piranhacms.org

- Open source headless CMS and content management hub. https://squidex.io

Umbraco is a free open source Content Management System built on the ASP.NET platform

An asynchronous, persistent key-value store

Thread-safe in-memory caches optimized for very high concurrent throughput, near optimal hit rate and low latency.

An efficient multi-layered caching system for .NET (In-Memory, Redis, Database, File etc)

An ASP.NET Web API HTTP caching implementation both on client and server

A common interface and abstraction layer for caching.

A caching library that contains basic and some advanced usages of caching which can help handle caching more easier! - NOTE: This is not affiliated with Microsoft or .NET

10X faster alternative to MemoryCache for .NET

A common interface with in memory, Redis and hybrid implementations.

An easy to use, high performance and robust cache with an optional distributed 2nd layer and some advanced features, like a fail-safe mechanism and advanced timeouts management

iCal.NET is an iCalendar (RFC 5545) class library for .NET aimed at providing RFC 5545 compliance, while providing full compatibility with popular calendaring applications and libraries.

Official .NET API client for Stream Chat, a service for building chat applications.

- This library provides a universal interface for accessing and manipulating data in different cloud blob storage providers (Azure Storage, AWS S3, Google Cloud Storage. It makes it easy to switch between providers or to use multiple providers simultaneously, without having to learn and use multiple APIs.

A polycloud .NET cloud storage abstraction layer originally known as Storage.Net. Provides a generic interface for Blob storage (AWS S3, GCP, FTP, SFTP, Azure Blob/File/Event Hub/Data Lake) and Messaging (AWS SQS, Azure Queue/ServiceBus).

Cloud Storage library with AWS, Azure and many other providers supported.

Bloat-free zero dependency .NET cloud storage kit that supports at minimum THE major cloud providers.

A number of Roslyn diagnostic analyzers initially developed to help flesh out the design and implementation of the static analysis APIs.

Suite of continuous benchmarking tools designed to catch performance regressions in CI.

Powerful .NET library for benchmarking.

is a Visual Studio and VS Team Services extension that estimates your .NET code quality and Technical-Debt, that lets create code rules with C# LINQ syntax, visualize code structure and focus on changes and evolution. [$]

Static code analysis tool to enforce namespace dependency rules in C# projects.

PVS-Studio is a static analyzer on guard of code quality, security (SAST), and code safety. [Free for OSS] [$]

StyleCop analyzes C# source code to enforce a set of style and consistency rules

Is a tool for benchmarking your Hypertext Transfer Protocol (HTTP) server.

Write, compile and run C#, F# and VB code in the browser. The .Net equivalent of JSFiddle.

Examine the generated SQL for migrations and queries by writing DbContext and queries using it in the browser. Learn by example, compare different versions of Entity Framework and providers such as MS SQL, PostgreSql and Sqlite.

Run C# code using different branches and versions of Roslyn, see the IL that was produced and examine the JIT's output.

A port of Clojure to the CLR in C#

Rewrite of Clojure CLR in F#

A polyglot REPL built on .NET Interactive

Eiffel for .NET is the Eiffel programming language made available in the .NET environment.

The F# programming language empowers everyone to write succinct, robust, and performant code

F# to JavaScript, TypeScript, JSX, Python, Dart, and Rust transpiler

CIL (C#, VB.Net, F#, ClojureCLR, ...) to CUDA compiler. [$]

A Java Virtual Machine and Bytecode-to-IL converter for .NET. Execute compiled Java code (bytecode) on .NET

A Python 3 implementation that is integrated with the .NET framework.

R6RS Scheme compiler, runtime and many standard libraries

A library for patching, replacing, and decorating .NET and Mono methods during runtime, mainly used for game modding.

A Lua implementation on .NET in C#

A dynamically typed scripting language written in C# with a REPL, debugger, and simple embedding API

Nemerle is a high-level statically-typed programming language for the .NET platform. It offers functional, object-oriented, and imperative features. It has a simple C#-like syntax and a powerful meta-programming system.

P is a language for asynchronous event-driven programming.

Pascal implementation on .NET.

PeachPie is a PHP compiler and runtime for .NET and .NET Core, which allows entire PHP applications to run on the modern, secure and performant .NET and .NET Core platforms.

The .NET Compiler Platform ("Roslyn") provides open-source C# and Visual Basic compilers with rich code analysis APIs. It enables building code analysis tools with the same APIs that are used by Visual Studio.

Experimental Rust compiler for .NET.

Mono runtime embedded in Rust.

A .NET Wrapper of Fast LZMA2 Algorithm.

SharpCompress is a compression library for .NET/Mono/Silverlight/WP7 that can unrar, un7zip, unzip, untar unbzip2 and ungzip with forward-only reading and file random access APIs. Write support for zip/tar/bzip2/gzip are implemented

AgileConfig is a lightweight configuration center that helps you manage all your application's configurations through website. - NOTE: This is not affiliated with Microsoft or .NET

.NET Continuous Integration and Deployment as a service. [$] [Free for OSS]

Continuous Integration and Deployment, Hosted Package Repository for NuGet, NPM, Bower and VSIX [$]

Ready to work, extensible and developer-friendly build server — out of the box [$]

Together with the .Net System.Security.Cryptography, the reference implementation for cryptographic algorithms on the CLR.

.NET simple crypto library. Native c#.

A managed-only cryptography library for .NET which provides modern cryptographic primitives.

A Paseto (Platform-Agnostic Security Tokens) implementation for .NET

Managed .NET wrapper for unmanaged PKCS#11 libraries that provide access to the cryptographic hardware

.NET crypto library. Professionally audited.

DBreeze Database is an open-source embedded Key-Value store

The open-source, functional database with Complex Event Processing in JavaScript

Distributed in-memory platform: document database with SQL and LINQ support; distributed computations; distributed services and events.

Simple JSON flat file data store with support for typed and dynamic data

A .NET NoSQL Document Store in a single data file - https://www.litedb.org

PostgreSQL as a document database and event store for .NET applications

A LINQ-enabled document database for .NET

A fast, easy-to-use alternative to SQLite & ORMs - https://realm.io/docs/dotnet/latest/

C# binding for Facebook's RocksDB Key-Value store + native builds for Windows, macOS and Linux

Event store for Azure Table Storage

A .NET document database working on any RDBMS

Persistent, high-performance, transactional, and ACID-compliant ordered key-value database for .NET.

DataStax .NET driver for Apache Cassandra

Official Couchbase .NET client library, based on the Enyim memcached client

.NET data provider for DuckDB

The .NET Data provider is written in C# and provides a high-performance, native implementation of the Firebird API

Official MongoDB C# driver

Connector/Net is a fully-managed ADO.NET driver for MySQL

.NET data provider for PostgreSQL

.NET client for rqlite (distributed relational DB based on SQLite)

.NET's leading C# Redis client

General purpose Redis client from StackExchange

Common Date Time operations on the form of extensions to System.DateTime, including holidays and working days calculations on several culture locales.

DateTimeRange, Business Day and various DateTime, DateTimeOffset, TimeSpan extension methods.

Noda Time is an alternative date and time API for .NET. It helps you to think about your data more clearly, and express operations on that data more precisely. https://nodatime.org/

open-source .NET assembly browser, editor, decompiler and debugger

Unofficial revival of dnSpy

Free-of-charge standalone tool based on ReSharper's bundled decompiler. It can reliably decompile any .NET assembly into equivalent C# or IL code. It can create Visual Studio solutions based on the original binary files in a straight-forward way. [Proprietary] [Free]

ILSpy is the open-source .NET assembly browser and decompiler

.NET library that helps you to deploy changes to SQL Server databases. It tracks which SQL scripts have been run already, and runs the change scripts that are needed to get your database up to date

Sucrose is a versatile wallpaper engine that brings life to your desktop with a wide range of interactive wallpapers.

Cross platform .NET standard libraries for DirectX, WIC, Direct2D1, XInput, XAudio and X3DAudio

Raft implementation for .NET and ASP.NET Core that allows to build clustered microservices powered by distributed consensus and replication

Akka.NET is a port of the popular Java/Scala framework Akka to .NET. This is a community-driven port and is not affiliated with Typesafe who makes the original Java/Scala version.

Orleankka is a functional API for Microsoft Orleans framework. It is highly suitable for scenarios where having composable, uniform communication interface is preferable, such as: CQRS, event-sourcing, re-routing, FSM, etc. Additional API available for F# called Orleankka.FSharp.

Proto Actor - Ultra fast distributed actors for Golang and C#

Zebus is a lightweight, highly versatile, peer-to-peer service bus, built with CQRS principles in mind. It allows applications to communicate with each other in a fast and easy manner. Most of the complexity is hidden in the library and you can focus on writing code that matters to you, not debugging messaging code. A very fundamental base for any distributed application.

Tools for building and publishing API documentation for .NET projects

Your friendly static documentation generator, using markdown files to build the content.

Tools for documenting F# and C# projects from F# script files, Markdown documents and inline XML or Markdown comments

Swagger-like UI tool like Swagger, but for SignalR hubs — auto-discover your hubs, explore methods, invoke calls, and preview live client messages..

Sandcastle Help File Builder similar to NDoc

Source browser website generator that powers https://referencesource.microsoft.com

Seamlessly adds a Swagger to Web API projects.

The official Adyen Payment API Library for .NET

Headless, multi-vendor, multi-tenant, the most advanced open source e-commerce platform based on .NET Core 5.0 and MongoDB.

nopCommerce. Free open-source e-commerce shopping cart (ASP.NET Core)

Typed .NET clients for stripe.com REST APIs

Super simple ecommerce system built on .NET Core. Simple to use and easy to customize. Thanks to .NET Core, you can run the SimplCommerce on Windows, Linux. With various RDBMS: Microsoft SQL Server, PostgreSQL, MySQL

Free ASP.NET Core MVC e-commerce Shopping Cart Solution

Stripe.net is a full service .NET API for https://stripe.com/

Virto Commerce is the second generation release and is the only enterprise level e-commerce product fully available under Open Source license. Virto Commerce is based on .NET 4.5 with extensive use of MVC, IoC, EF, Azure, AngularJS and many other cutting edge technologies. It can be deployed in Microsoft Cloud (Azure), Amazon Web Services (AWS) and on-premise. https://virtocommerce.com

ETL Framework for .NET (Read / Write CSV, Flat, Xml, JSON, Key-Value formatted files)

Lightweight ETL (extract, transform, load) library and data integration toolbox for .NET built on top of Microsoft TPL.Dataflow library.

BizHawk is a multi-system emulator written in C#. BizHawk provides nice features for casual gamers such as full screen, and joypad support in addition to full rerecording and debugging tools for all system cores.

The cross-platform .NET Core command-line toolchain utility.

EventFlow is an Async/await first CQRS and Event Sourcing DDD framework for .NET

An easy-to-use and ambitious in-process mediator providing the foundation to implement Command Query Separation (CQS)

A simple mediator for .NET for sending command, publishing event and request response with pipelines supported

Simple, unambitious mediator implementation in .NET

Exceptionless .NET Client

Site with collection of extension methods

This library provides a way to develop and expose application functionality based on feature flags. It enables scenarios like new feature rollouts and A/B testing for experimentation purposes. It also provides integration with common .NET coding patterns and ASP.NET Core.

OpenFeature is an open standard for feature flag management designed to provide a unified API and SDK, enabling developers to decouple feature flag evaluation from vendor-specific implementations. It promotes interoperability, flexibility, and standardization for managing feature flags across different tools and platforms.

This library uses and abuses the features of C# 6+ to provide a functional 'Base class library', that, if you squint, can look like extensions to the language itself. It also includes an 'Erlang like' process system (actors) that can optionally persist messages and state to Redis (note you can use it without Redis for in-app messaging). The process system additionally supports Rx streams of messages and state allowing for a complete system of reactive events and message dispatch.

Provides extra methods to LINQ to Objects.

Easily parse or convert coordinate formats and calculate location based solar/lunar information.

.Net library for Digital Elevation Models, allows 3D terrain generation in glTF / STL format.

.Net library for GeoJSON types & corresponding Json.Net (de)serializers

A .NET GIS solution that is fast and reliable for the .NET platform

C# library to work with OpenStreetMap (OSM) data. Provides reading, writing and route-planning for OSM data.

A multi-platform .NET UI framework (formerly known as Perspex).

Cross-platform GUI framework for desktop and mobile applications in .NET and Mono

Gtk# is a Mono/.NET binding to the cross platform Gtk+ GUI toolkit and the foundation of most GUI apps built with Mono

Lara Web Engine is a library for developing Web user interfaces in C# - (Blazor Server-Side Alternative)

Build .NET desktop applications using HTML, CSS, javascript and MVVM bindings such as with WPF.

Photino is a lightweight open-source framework for building native, cross-platform desktop applications with Web UI technology.

A cross-platform Qml/.NET integration for Mono/.NET/.NET Core

Mono/.NET Bindings for Qt

Create .NET cross-platform desktop apps using not just HTML, but all features of Sciter engine: CSS3, SVG, scripting, AJAX, <video>... Sciter is free for commercial use

The only platform for building native mobile, desktop and WebAssembly with C#, XAML from a single codebase. Open source and professionally supported. Website: platform.uno

The Windows UI Library (WinUI) provides official native Microsoft UI controls and features for Windows UWP apps.

Build native UIs for iOS, Android and Windows from a single, shared C# codebase.

A cross-platform UI toolkit for creating desktop applications with .NET and Mono

Lightweight UI toolkit for WPF applications offering classic but enhanced Windows visuals.

Carefully crafted Winforms controls and components for creating stunning modern application UI. [$]

Multi-platform and multi-engine XAML based user interface library [Free][Proprietary]

Contains some simple and commonly used WPF controls

Toolkit for creating Metro-styled WPF apps

Toolkit for creating Material Design styled WPF apps

Theming .NET WinForms, C# or VB.Net, to Google's Material Design principles.

Set of controls and styles to convert WPF applications into a great looking Modern UI apps.

The UWP Community Toolkit is a collection of helper functions, custom controls, and app services. It simplifies and demonstrates common developer tasks building UWP apps for Windows 10.

The WPF-based text editor component used in SharpDevelop

A control toolkit for Windows 8 XAML applications. Contains some UI controls to make it easier to create Windows UI style apps for the Windows Store in accordance with Windows UI guidelines.

The Visual Studio inspired docking library for .NET WinForms

ObjectListView is a C# wrapper around a .NET ListView. It makes the ListView much easier to use and teaches it some new tricks

A simple, direct, ultra-thin CLR library for high-performance Win32 Native Interop with automation, windowing, DirectX, OpenGL and Skia helpers.

BEPUphysics is a pure C# 3D physics library

A C# port of Box2D, a 2D physics engine for games, servers, and Unity3D

A port of Recast & Detour, navigation mesh toolset for games, Unity3D, servers, C#

Duality is a 2D game development framework. Focused on modularity, comes with a visual editor.

FNA is an XNA4 reimplementation that focuses solely on developing a fully accurate XNA4 runtime for the desktop

Foster is a small cross-platform 2D game framework in C#.

High-performance C# ECS with simple API. Supports .NET, WASM/WebAssembly, Native AOT, Unity, Godot, MonoGame, ...

One framework for creating powerful cross-platform games

Nez is a free 2D-focused framework that works with MonoGame and FNA

A 2D application/game written with amazing games in mind.

Stride Game Engine is a 2D/3D cross-platform game engine featuring a scene editor, particles, physically based rendering (PBR), scripting, and much more

Wave engine is a free C# component-based modern game engine which allows you to create cross-platform games supporting Kinect, Oculus Rift, Vuforia, Cardboard, Leap Motion and much more. [Free][Proprietary]

Helps solving issues of credentials

GitExtensions is a shell extension, a Visual Studio 2008/2010/2012/2013 plugin and a standalone Git repository tool. https://gitextensions.github.io/

Generate a Semantic Version Number based on the state of your Git repository

Git hooks made easy with Husky.Net internal task runner, You can use it to lint your commit messages, run tests, lint code, etc... when you commit or push. supports C# scripts, gitflow hooks, Multiple file states (staged, lastCommit, glob)

LibGit2Sharp brings all the might and speed of libgit2, a native Git implementation, to the managed world of .NET and Mono.

A PowerShell environment for Git

library to build a GraphQL API on top of data model with the extensibility to easily bring multiple data sources together in the single GraphQL schema (EF is not a requirement - any ORM working with LinqProvider or an in-memory object will work).

Implementation of Facebook's GraphQL in .Net

GraphQL server compatible to all GraphQL compliant clients like Strawberry Shake, Relay, Apollo Client, and various other clients and tools.

high-performance C#-friendly GraphQL client. It supports Linq-like syntax. It doesn't require Reflection.Emit or expressions. As a result, the runtime provides performance very close to a raw HTTP call.

Fully managed, cross-platform, complete 2D graphic library for drawing text, geometries, and images, with System.Drawing compatible API. [$]

A cross-platform .NET Standard wrapper for the Open Asset Importer ("Assimp"). The library enables importing, processing, and exporting of 3D models for rendering in graphics/game applications. Over 40 formats are supported for importing (e.g. OBJ, FBX, GLTF, 3DS, Collada) and a subset of those formats can be exported to (e.g. OBJ, GLTF, 3DS, Collada). Mesh processing features allow for mesh data to be generated or optimized for real-time rendering.

Helix Toolkit is a collection of 3D components for .NET

Simple, flexible, interactive & powerful charts, maps, and gauges for .Net. LiveCharts2 supports WPF, WinForms, Xamarin, Avalonia, WinUI, UWP.

The Open Toolkit is an advanced, low-level C# library that wraps OpenGL, OpenCL and OpenAL

OxyPlot is a cross-platform plotting library for .NET

A plotting library to interactively displays large datasets. Line plots, bar charts, pie graphs, scatter plots, and more. It supports WinForms, WPF, Avalonia, Console.

A cross-platform, high-performance, low-level .NET Standard wrapper for many advanced APIs such as OpenGL, OpenCL, OpenAL, OpenXR, Assimp, GLFW, as well as many others. In addition to wrapping over Native APIs, it also comes with its own Windowing and Input abstraction. This makes game and application development with Silk.NET a breeze, and has pretty much everything a 3D application developer would need.

.NET library to create vector graphics and text, and then export it to PDF, SVG and raster image formats.

A low-level, portable graphics and compute library for .NET

Complete HTML5 DOM and CSS3 OM construction

.NET port of the Ruby Less CSS lib http://www.dotlesscss.org

CSS3 parser library for C#

an agile HTML parser that builds a read/write DOM and supports plain XPath or XSLT

.NET wrapper around the libSass library with the ability to support a virtual file system

Refit based web api client, but resilient (retry, connectivity, cache, auth, log, priority, etc...).

Fluent, portable, testable REST/HTTP client library

A fully managed and fully streamed Man-On-The-Middle library to intercept, record and alter HTTP/1.1, H2, websocket traffic over plain or secure channels.

Strongly-typed, extensible HTTP client with fluent request builder, streaming & multipart. Built on .NET's HttpRequestMessage.

The automatic type-safe REST library for Xamarin and .NET

Simple REST and HTTP API client for .NET

An open source project based on the HttpClient. You only need to define the c# interface and modify the related features to invoke the client library of the remote http interface asynchronously.

A cross-platform IDE with C# & Java support, fork of IntelliJ IDEA Community Edition

A free Visual Studio Extension for MongoDB users, helping translate your code into MongoDB queries

An Atom Editor and Visual Studio Code package suite for cross platform F# development.

A cross-platform C# IDE based on the IntelliJ platform and ReSharper

A simple C# editor based on Roslyn and AvalonEdit.

Excellent open source editor from Microsoft, based on Electron.

A full-featured IDE

A visual live-programming environment for .NET [Free for OSS]

A simple and fast code editor that makes fun program with C# or Visual Basic.

Open source .NET library for working with color spaces.

Cross-platform .NET wrapper for the OpenCV library.

Add commands to image URLs to get altered versions in milliseconds. Resizing, editing etc of images in real-time.

Fully managed cross-platform library for processing of image files.

Image processing webservice based on ASP.NET Core and ImageSharp / SkiaSharp / SvgNet / DocNET

.NET wrapper for the ImageMagick library.

High-performance image processing pipeline for .NET, focused on making complex imaging tasks simple.

Extracts Exif, IPTC, XMP, ICC and other metadata from image files.

Cross platform wrapper of OpenCV for .NET Framework.

Cross-platform (Windows/macOS/Linux) image viewer which supports reading raw Luminance/YUV/RGB/ARGB/Bayer pixels data from file and rendering it. 10/16-bit YUV and viewing image frame sequence are also supported (v1.99+).

A simplified path to Insight. Open-source multi-dimensional image analysis in Python, R, Java, C#, Lua, Ruby, TCL and C++. Developed by the Insight Toolkit community for the biomedical sciences and beyond.

Colour conversion, interpolation, and comparison for .NET.

like yum or apt-get, but for Windows.

An unopinionated auto-update framework for desktop applications.

Squirrel is both a set of tools and a library, to completely manage both installation and updating your desktop Windows application.

The most powerful set of tools available to create your Windows installation experience

.NET Interactive takes the power of .NET and embeds it into your interactive experiences.

ICU MessageFormat implementation in .NET lets you write contextual UI messages (PCL library)

The most popular free tool to localize all kind of applications with resx-based resources.

Tools to surface C++ APIs to C#

A library containing P/Invoke code for latest Windows OS.

This library allows your Java or .NET program to interface very easily with

Python and .NET interop framework

An addictive .NET IoC container

Simple, fast all fully featured IoC container.

A fast IoC container heavily optimized for usage within ASP.NET Core and other .NET server side applications.

A ultra lightweight IoC container

The default IoC container for NET applications.

The ninja of .NET dependency injectors

Assembly scanning extensions for Microsoft.Extensions.DependencyInjection.

Simple Injector is an easy-to-use Dependency Injection (DI) library for .NET 4+ that supports Silverlight 4+, Windows Phone 8, Windows 8 including Universal apps and Mono.

A lightweight, portable dependency injection framework for .NET based solutions.

Managed Extensibility Framework (MEF) implementation used by Visual Studio.

A library that makes it easy to add scripting to your .NET applications. It currently supports JavaScript (via V8 and JScript) and VBScript.

Run .NET and Node.js code in-process on Windows, macOS, and Linux

JavaScript interpreter for .NET which provides full ECMA 5.1 compliance and can run on any .NET platform.

A implementation of the ECMAScript language and runtime. It aims to provide the best performing and most standards-compliant implementation of JavaScript for .NET.

JavaScript Runtime (Similar to NodeJS) for .NET Standard, compiles JavaScript to IL, support for many ES6 features, generators, CommonJS modules, CSX modules and expression compiler.

A source generator that automatically migrates all logging calls to high-performant LoggerMessage version.

Logs errors. Includes useful diagnostic info like stack trace, session, release, etc. Has a free tier. [Free for OSS][$]

Official ELMAH site

Elmah for MVC

Cloud logging for .NET web applications using ELMAH. Find bugs before you go live. Powerful search, API, integration with Slack, GitHub, Visual Studio and more. [Free for OSS] [$]

A fluent logging API that can be used to log messages throughout your application.

The Apache log4net library is a tool to help the programmer output log statements to a variety of output targets

Logary is a high performance, multi-target logging, metric, tracing and health-check library for Mono and .NET. .NET's answer to DropWizard. Supports many targets, built for micro-services.

Open source NLog viewer for Windows

Centralized .NET logging and monitoring. [Proprietary] [Free Tier]

NLog - Advanced .NET and Silverlight logging

Simplifies real-time remote error monitoring while using Rollbar.com. Open-source Rollbar Notifier SDK for any .NET-based technology stack. The SDK that can be used in any application built on the following .NET versions: .NET Core 2.0+, .NET Standard 2.0+, .NET Full Framework 4.5.1+, Mono, Xamarin, and, in general, any implementation of the .NET Standard 2.0+. It simplifies building data payloads based on exception data, tracing data, informational messages, and telemetry data and sends the pay

.NET SDK for Sentry Open-source error tracking that helps developers monitor and fix crashes in real time..

A no-nonsense logging library for the NoSQL era. Combines the best of traditional and structured diagnostic logging in an easy-to-use package.

Error handler used for the Stack Exchange network

Cross-Platform (Windows/macOS/Linux) Universal Log Viewer which supports reading and parsing various type of logs. You can also define your own profile to parse and show logs.

ZeroLog is a zero-allocation .NET logging library. It provides basic logging capabilities to be used in latency-sensitive applications, where garbage collections are undesirable.

The HiveMQ C# MQTT client for .NET

A high performance .NET library for MQTT based communication. It provides a MQTT client and a MQTT server (broker).

A small, yet powerful framework, designed for building applications across all XAML platforms. Its strong support for MV patterns will enable you to build your solution quickly, without the need to sacrifice code quality or testability.

Catel is an application development platform with the focus on MVVM (WPF, Silverlight, Windows Phone and WinRT) and MVC (ASP.NET MVC). The core of Catel contains an IoC container, models, validation, memento, message mediator, argument checking, etc.

Collection of control & helper libraries and samples for various .NET technologies. Contains modern MVVM library, supported by Microsoft. Includes Windows Community Toolkit, MAUI Community Toolkit, and Dotnet Community Toolkit.

Framework simplifying the concept of opening dialogs from a view model when using MVVM in WPF or UWP.

Cross-platform mvvm mobile development framework for WPF, Silverlight for WP7 and WP8, Mono for Android, MonoTouch for iOS, Windows Universal projects (WPA8.1 and Windows 8.1 Store apps). Makes extensive use of Portable Class Libraries (PCL) to provide maintainable cross platform C# native applications.

A cross-platform desktop and mobile MVVM development framework.

An MVVM framework for .NET that integrates the Reactive Extensions (Rx) framework, enabling developers to build elegant, testable applications using WPF, Windows Store Apps, WP8 or Xamarin.

Minimal MVVM framework inspired by Caliburn Micro, with good documentation, high test coverage, and its own IoC container

Visual Composition framework to easily build modularized MVVM applications based on the Managed Extensibility Framework (MEF).

A lightweight Framework that helps you to create well structured WPF and UWP Applications. It supports you in applying a Layered Architecture and the Model-View-ViewModel pattern.

Cross-platform Natural Language Processing (NLP) library inspired by spaCy, with pre-trained models, out-of-the box support for training word and document embeddings, and flexible entity recognition models. Part of the SciSharp Stack

F# type providers for accessing XML, JSON, CSV and HTML files (based on sample documents) and for accessing WorldBank data

A collection of data science and machine learning libraries for F# and .NET

Multi-platform genetic algorithm library for .NET Core and .NET Framework. The library has several implementations of GA operators, like: selection, crossover, mutation, reinsertion and termination.

A framework for running Bayesian inference in graphical models. It can also be used for probabilistic programming.

Cross-platform open-source machine learning framework which makes machine learning accessible to .NET developers.

Genetic algorithm .NET library for solving optimization problems, featuring extensible operators and adaptive strategy selection.

A rich machine learning ecosystem for .NET created by porting the most popular Python libraries to C#.

A complete cross-platform mail stack including IMAP, POP3, SMTP, authentication and more. Built on top of MimeKit.

A fully-featured fluent wrapper for MailKit that makes sending and receiving emails as simple as possible.

A cross-platform .NET MIME creation and parser library with support for S/MIME, PGP, TNEF and Unix mbox spools.

C# library that moves your stylesheets to inline style attributes, for maximum compatibility with e-mail clients.

Client for SendGrid's v3 API. Not only allows you to send emails, but also allows you to bulk import contacts, manage lists and segments, create custom fields for your lists, etc. Also includes a parser for SendGrid Webhooks.

A fast, powerful, CommonMark compliant, extensible Markdown processor for .NET.

ALGLIB is a cross-platform numerical analysis and data processing library. It supports several programming languages (C++, C#, Delphi) and several operating systems (Windows and POSIX, including Linux) [Proprietary] and [Free Edition]

An open-source symbolic/computer algebra library, made primarily for C# and F#. It covers a range of features and might be considered as an alternative to SymPy in .NET.

Simple and lightweight computational geometry library for .Net

Provides extra number types (such as fixed-point and non-overflowing numbers) with full support for operators, math, string-parsing etc. Extensively tested, and cross-platform compatible.

Comprehensive math expression library with symbolic computation support including differentiation, simplification, and equation solving.

Math.NET is an open source initiative to build and maintain toolkits covering fundamental mathematics, targeting advanced but also every day needs of .NET developers

A set of tools for graph layout and viewing.

A simple cross platform .NET API for Intel MKL.

Implementation of rational number arithmetic for .NET with arbitrary precision.

a .NET library for rendering mathematical formulae using the LaTeX typesetting style, for the WPF framework

An advanced audio library, supporting playback/recording, decoding/encoding and processing of audio data in realtime (effects, visualizations, ...).

Xamarin bindings for libvlc, the multimedia framework powering the VLC applications made by VideoLAN.

Playback, decode and encode audio in a variety of file formats such as MP3, MP4, WAV, AIFF, Speex, etc.

.NET Audio Framework for audio and MIDI playback, editing, and plugin integration.

TagLib# (aka taglib-sharp) is a library for reading and writing

.NET Standard wrapper for FFmpeg. It allows to process media without know how FFmpeg works, and can be used to pass customized arguments to FFmpeg from C# application. [$]

A common interface with in-memory, Redis, StatsD, and Metrics.NET implementations.

Send compressed static files to the browser without having to compress on demand, also has support for sending more advanced image formats when the browser indicates that i has support for it.

.NET library that contains a set of markup minifiers. The objective of this project is to improve the performance of web applications by reducing the size of HTML, XHTML and XML code.

Efficient reliable UDP unicast, UDP multicast, and IPC message transport - .NET port of Aeron

Take HTML Snapshots for your Angular, Ember, Durandal or any JavaScript applications

Simple build versioning for .NET, powered by Git tags

ByteSize is a utility class that makes byte size representation in code easier by removing ambiguity of the value being represented. ByteSize is to bytes what System.TimeSpan is to time.

A a .NET library to run C# code in parallel on the GPU through DX12, D2D1, and dynamically generated HLSL compute and pixel shaders.

Fluent library to create table for .Net console application.

Near-zero config .NET Core library that makes Task Scheduling, Caching, Queuing, Mailing, Event Broadcasting (and more) a breeze!

A web-based C# REPL with awesome code completion.

CS-Script is a CLR based scripting system which uses C# as a programming language. CS-Script currently targets Microsoft implementation of CLR (.NET 2.0/3.0/3.5/4.0/4.5) with full support on Mono. Comes with many additional features, such as script hosting.

Library to help reading and writing CSV files https://github.com/JoshClose/CsvHelper

The Universal Device Detection library will parse any User Agent and detect the browser, operating system, device used (desktop, tablet, mobile, tv, cars, console, etc.), brand and model.

Generate a 'device ID' that can be used to uniquely identify a computer.

A command-line tool for executing C# program without a project file, and you can have your custom entry point other than Main method.

Enums.NET is a high-performance type-safe .NET enum utility library

A small validation library for .NET that uses a fluent interface and lambda expressions for building validation rules.

Humanizer meets all your .NET needs for manipulating and displaying strings, enums, dates, times, timespans, numbers and quantities

A JIT (just-in-time) compiler for high-performance GPU programs written in .Net-based languages.

a library for persisting and restoring application state (a better alternative to .settings files).

a C#/VB/F# scratchpad that instantly executes any expression, statement block or program with rich output formatting and a wealth of features. Also lets you interactively query databases in LINQ. [$]

View SQL Server and Postgres query plans directly inside LINQPad.

Extension method for StringComparer that adds support for natural sorting (e.g. "abc1", "abc2", "abc10" instead of "abc1", "abc10", "abc2").

Express transient-exception-handling and resilience policies such as Retry, Wait-and-Retry, Circuit Breaker, and Bulkhead Isolation in a fluent manner. Fully thread-safe and full async support. (4.0 / 4.5 / .NET Core / .NET Standard / Xamarin).

RazorKit is a collection of lightweight, fluent-style Razor HTML helpers that make it easy for developers to integrate popular JavaScript libraries into their ASP.NET applications.

Library to help reading and writing CSV and Flat files with zero heap allocation.

World's Fastest .NET CSV Parser. Modern, minimal, fast, zero allocation, reading and writing of separated values (csv, tsv etc.). Cross-platform, trimmable and AOT/NativeAOT compatible.

High-performance, low-allocating JSON object diff and patch extension for System.Text.Json. Support generating patch document in RFC 6902 JSON Patch format.

TypeShape is a small, extensible F# library for practical generic programming

Validot is a performance-first, compact library for advanced model validation. Using a simple declarative fluent interface, it efficiently handles classes, structs, nested members, collections, nullables, plus any relation or combination of them. It also supports translations, custom logic extensions with tests, and DI containers.

Ultimate library for extracting metadata and downloading Youtube videos and playlists.

Ultra fast and low latency asynchronous socket server & client C# .NET Core library with support TCP, SSL, UDP, HTTP, HTTPS, WebSocket protocols and 10K connections problem solution (NETStandard).

Fully managed, cross platform (Windows, Mac, Linux) .NET library for capturing packets from live and file based devices.

A simple object mapper for .NET by StackExchange

The fastest micro-ORM extension for Dapper

Dapper Query Builder using String Interpolation and Fluent API

Entity Framework Core Bulk Extensions for super fast (BulkCopy) CRUD ops + SaveChanges on multiple DBs: SQL, PG, My, Lite.

Object-relational mapper that enables .NET developers to work with relational data using domain-specific objects

Use typed Exceptions for Entity Framework Core when your SQL query violates database constraints in SqlServer, MySql, PostgreSQL or SQLite

Simple library that can help to sync a large number of records in-memory into the database. Lambda Expression is supported.

Fluent, XML-less, compile safe, automated, convention-based mappings for NHibernate.

Fluent Migrations framework for .net

High performane ORM for Sqlite, MySql, SqlServer, PostgreSQL & NoSQL. Provides server with REST, GraphQL & WebSocket / PubSub API.

Insight.Database is a fast, lightweight, micro-ORM for .NET

The fastest LINQ database access library offering a simple, light, fast, and type-safe layer between your POCO objects and your database.

Entity Modeling solution for Entity Framework, NHibernate, Linq to SQL and its own ORM framework: LLBLGen Pro Runtime Framework. [$][Free Lite version]

An "Entity Framework"-like interface for MongoDB

NHibernate Object Relational Mapper

Simple microORM that maps the results of a query onto a POCO object. Based on Schotime's branch of PetaPoco

A tiny ORM-ish thing for your POCOs

A hybrid ORM library for .NET.

Light, simple and fast convention-based POCO ORM [Free for OSS] [$]

Another ORM library supports many RDBMS including MySql, SqlServer, Sqlite, Oracle, Postgresql - NOTE: This is not affiliated with Microsoft or .NET

A convention-based object-object mapper in .NET. https://automapper.org

A .NET source generator for generating object mappings. No runtime reflection.

A high performance object mapper in .net

ClosedXML makes it easier for developers to create Excel 2007/2010 files

DocX is a .NET library that allows developers to manipulate Word 2007/2010/2013 files, it does not require Microsoft Word or Office to be installed.

EPPlus is a .NET library that reads and writes Excel 2007/2010 files using the Open Office XML format (xlsx).

Lightweight and fast library written in C# for reading Microsoft Excel files (2.0-2007).

ExcelDna makes it easier to create and deploy Excel Add-Ins using C#, F# or VB .NET

A package of .NET components that enable fast, simple and efficient processing of office files (Excel, Word, PowerPoint, PDF and emails). [$][Free Lite versions]

Web-based invoice reconciliation platform with OCR extraction and automated purchase order matching using ASP.NET Core and Azure Form Recognizer.

A micro Excel helper avoids OOM and high performance to create/mapping/template-fill-data.

.NET wrapper assemblies for Microsoft Office applications.

This project is the .NET version of POI Java project at https://poi.apache.org/.

OfficeIMO makes it easier for developers to create/modify Word (docx) files without having Microsoft Word or Office installed

The Open XML SDK provides open-source libraries for working with Open XML Documents (DOCX, XLSX, and PPTX).

Library to work with the Outlook Object Model and (Extended) MAPI. Supports Outlook 98 - 2019. Work with objects/mails/accounts/folders in Exchange and Outlook. [$]

A fluent API for the processing of PowerPoint presentations without Microsoft Office installed.

A high-performance .NET Excel framework without Microsoft Office or interop dependencies. Create, read, and edit Excel documents seamlessly. Utilize Spreadsheet controls for creating, editing, and viewing easily. Effortlessly convert Excel files to PDF, images, and more with powerful conversion APIs. [$] [Free for Individuals and Small Businesses]

A high-performance .NET PowerPoint framework without Microsoft Office or interop dependencies. Create, read, and edit PowerPoint files seamlessly. Effortlessly convert PowerPoint files to PDFs and images with powerful conversion APIs. [$] [Free for Individuals and Small Businesses]

A high-performance .NET Word framework without Microsoft Office or interop dependencies. Create, read, and edit Word documents seamlessly. Utilize advanced editor components for easy viewing, editing, and printing. Effortlessly convert Word documents to PDF, HTML, RTF, ODT, and EPUB formats with powerful conversion APIs. [$] [Free for Individuals and Small Businesses]

.NET text extraction framework supports a few file formats

Cloudmersive PDF is a native .NET Framework and .NET Core NuGet library and API service that can create, modify, encrypt or convert PDF documents at high scale and fidelity; and is free to use with no expiration [Free]

PDF library to create, read, edit, draw, and print PDF documents in .NET and .NET Core applications. 100% managed, without unsafe blocks. [$] [Free for OSS]

High-performance C# PDF library with compatibility for various .NET versions, HTML to PDF conversion, content page conversion, file format support (e.g., DOCX, RTF, MD), responsive layouts, and robust PDF capabilities features ranging from compability, generating PDFs, formatting PDFs, and editing PDFs. [$] [Free trial available]

iText is a PDF library that allows you to CREATE, ADAPT, INSPECT and MAINTAIN documents in the Portable Document Format (PDF)[$] [Free for OSS]

A wrapper to drive the awesome pdftk binary, which can fill PDF forms, get field information, concatenate multiple documents or pages, split documents, add or replace stamps, and can attach files to or download files from pages.

Advanced C# PDF library for render, create, edit, merge, split, print, and view PDFs. Open source PDF Viewer is available on GitHub. A NuGet package is also available for easy inclusion into your projects.[$]

Read and create and extract text and other content from PDFs in C# (port of PdfBox)

A C# wrapper written around QPdf to allow for easy PDF manipulation that is tested for both linux and windows. QPdf is one of the only libraries capable of PDF linearization, and this wrapper ensures you keep up to date with the underlying improvements.

QuestPDF is a modern and battle-tested library that can help you with generating PDF documents by offering friendly, discoverable and predictable C# fluent API. [Source Available] [Free for OSS]

A high-performance .NET PDF framework with no Adobe dependencies. Create, read, and edit PDF files seamlessly. Utilize PDF viewer controls for easy viewing, reviewing, and printing. Effortlessly convert HTML, Word, Excel, PowerPoint files, and images to PDF with powerful conversion APIs. [$] [Free for Individuals and Small Businesses]

A fully managed package management SaaS, with support for NuGet, Npm, Docker and much more. [Free for Public/OSS] [$]

The .NET package manager

A package dependency manager for .NET with support for NuGet packages and GitHub repositories. https://fsprojects.github.io/Paket/

A NuGet v3 static feed generator with support for AWS S3 and Azure Storage

A light embedded C# lexer/parser generator.

A recursive descent parsing library with operator overloading for C#.

A lightweight, fast and flexible parsing library for C#, developed at Stack Overflow

A pratt parser library.

A C# parser construction toolkit with high-quality error reporting

A simple but effective mini-profiler for ASP.NET websites

A simple yet very powerful and high performant open source library for the .NET Framework to do DNS lookups.

An FTP and FTPS library for .NET, optimized for speed. Provides extensive FTP commands, file uploads/downloads and FTP proxies.

An open source SNMP implementation for .NET/Mono/Xamarin. Version 1, 2c, and 3 are supported.

A Secure Shell (SSH) library for .NET, optimized for parallelism. Provides SSH commands, SFTP/SCP uploads and downloads, and SOCKS4/SOCKS5/HTTP proxies.

A library and code generator to develop SiLA2 clients and servers.

SQL Builder using String Interpolation and Fluent API

Elegant SQL query builder, that supports complex queries, joins, sub queries, nested where conditions, vendor engine targets and more

Facilitates simple asynchronous messaging in dotnet apps.

Command Dispatcher, Processor, and Distributed Task Queue https://www.goparamore.io/

An EventBus with local persistent message functionality for RabbitMQ or Kafka. - NOTE: This is not affiliated with Microsoft or .NET

Implementation of the Outbox pattern and OnceExecutor service that guarantees idempotence: the operation will be performed once

Confluent's .NET Client for Apache Kafka.

An easy to use .NET API for RabbitMQ

A common interface with in-memory, Redis and Azure implementations.

Incredibly easy way to perform fire-and-forget, delayed and recurring tasks inside ASP.NET applications

MassTransit is lean service bus implementation for building loosely coupled applications using the .NET Framework.

NetMQ is 100% native C# port of ZeroMQ

The most popular service bus for .NET

Implementation of an AMQP client library for C#, and a binding exposing AMQP services via WCF

Rebus is a lean service bus implementation for .NET, similar in nature to NServiceBus and MassTransit, only leaner

A simple but feature-rich message bus for .NET core (supports Kafka, RabbitMQ and MQTT).

Lightweight message bus with transports for popular messaging systems (Kafka, Redis, Azure Service Bus, and others) and in-memory communication.

a .NET Stream Processing Library for Apache Kafka.

An easy to use service bus and microservices platform. Easily build applications and services in a visual IDE.

An RPC library and framework for .NET Core. Read more about it on Docs Microsoft

gRPC UI is a command-line tool that lets you interact with gRPC servers via a browser. It's sort of like Postman, but for gRPC APIs instead of REST.

gRPCurl is a command-line tool that lets you interact with gRPC servers. It's basically curl for gRPC servers.

Reactive Extensions (Rx) for collections

The Reactive Extensions (Rx) is a library for composing asynchronous and event-based programs using observable sequences and LINQ-style query operators

A cross platform C# .NET library supporting SIP, VoIP and WebRTC.

The AWS SDK for .NET enables .NET developers to easily work with Amazon Web Services

A set of PowerShell cmdlets for developers and administrators to develop, deploy and manage Microsoft Azure applications

Windows SDK for Countly analytics and marketing platform for product and marketing managers

Official .NET SDK for the Dropbox API

SDK for the Getty Images and iStock APIs

A GitHub API client library for .NET

A C#/.NET Library for sending and receiving phone calls and text messages with Twilio.

This framework allows users to write long running persistent workflows in C# using the async/await capabilities.

An easy way to perform fire-and-forget, delayed and recurring tasks inside .NET apps

Human-readable scheduling library for .NET using natural-language expressions.

A Job Scheduler sitting on top of IHostedService in dotnet.

Class library for parsing & formatting crontab expressions as well as calculating occurrences of time based on a crontab schedule

Simple task scheduler library for scheduling NCrontab-based tasks

A powerful and intuitive .NET library for defining, filtering, transforming, and scheduling instant and period timelines.

Quartz Enterprise Scheduler .NET

Lightweight, high-performance, reflection-free job scheduler for .NET with EF Core, cron/time-based execution, custom locking, and retry support.

Lightweight embeddable workflow engine

Elasticsearch.Net & NEST

Smallest full text search engine (lucene replacement). built from scratch using inverted Roaring bitmap index, highly compact storage, operating in database and document modes

Lucene.Net is a port of the Lucene search engine library, written in C# and targeted at .NET runtime users

Lunr-core is a small, full text search library for use in small applications. It's a .NET port of LUNR.js.

Solr client for .NET

efficient full-text search library. extends ZoneTree. It is fast, embedded search engine suitable for applications that require high performance and do not rely on external databases.

Very simple & lightweight CSV exporter, Excel friendly, escapes text & quotes etc.

F# type providers for accessing XML, JSON, CSV and HTML files (based on sample documents) and for accessing WorldBank data

Fast, idiomatic FlatBuffers implementation. Use .fbs files or attributes.

A profile-based Serializer for multiple data-formats.

A high performance polymorphic serializer for the .NET framework.

Popular high-performance JSON framework for .NET

Fast and flexible serialization framework usable on undecorated classes.

MessagePack implementation for Common Language Infrastructure

Serializes in-memory object to C# code.

Protocol buffers is the name of the binary serialization format used by Google for much of their data communications

This community maintained list showcases .NET open source projects that are useful for any aspect of the development process.

Open Source .NET libraries that make your life easier

A complete guide to become a ASP.NET Developer.

A list of what .NET libraries and frameworks are currently supported by ASP.NET Core and .NET Core).

A collection of awesome .NET core libraries, tools, frameworks and software

A curated list of awesome .NET Performance books, courses, trainings, conference talks, blogs and most inspiring open source contributors.

A collection of awesome training series, articles, videos, books, courses, sample projects, and tools for Microservices in .NET Core.

A curated list of awesome Roslyn books, tutorials, open source projects, analyzers, code fixes, and refactorings.

A categorized community-driven collection of high-quality awesome Unity assets, projects, and resources.

A collection of interesting libraries/tools for Xamarin mobile projects.

A curated list of .NET Compiler Platform ("Roslyn") diagnostic analyzers and code fixes.

A curated list of Domain-Driven Design (DDD), Command Query Responsibility Segregation (CQRS), Event Sourcing, and Event Storming resources

A curated collection of awesome LINQ libraries, tools, and more.

Code Generation Toolkit where templates are written using plain C#. Command-line tool, MSBuild task, Visual Studio Extension, and Roslyn Source Generator.

Awesome .NET open source and community resources.

Game examples implemented in .NET console applications.

A simple source generator for discriminated unions in C#.

Sorted lists of awesome .NET repositories, with counts of stars, issues, and forks!

List of Automated Testing (TDD/BDD/ATDD/SBE) Tools and Frameworks for .NET

Effortlessly generate fluent APIs for your C# classes.

Check out NuGet packages adoption and what's trending on NuGet.

A C# source generator to create an enumeration class from an enum type. With this package, you can work on enums very, very fast without using reflection.

Generates synchronous methods from async ones to avoid code duplication.

A value object generator with analizers.

Weekly email newsletter with manually curated top 5 links from the .NET community.

Create state machines and lightweight state machine-based workflows directly in .NET code

Transform ASP.NET Core web app into a static site generator.

Jekyll-inspired static site generation for .NET

Utility software to strong-name sign .NET assemblies, including assemblies you do not have the source code for.

list of problematic asynchronous patterns for .NET Core with an explanation of how to solve those issues

Official MSDN C# code conventions

StackOverflow Q & A on style guides

C# port of the Ruby Liquid templating language

Fluid is an open-source .NET template engine based on the Liquid template language.

A real .NET Handlebars engine

A full sized {{mustache}} like template engine with focus on extendibility.

Open source template engine based on Microsoft's Razor parsing engine supporting .NET Standard 2.0

A fast, powerful, safe and lightweight text templating language and engine for .NET

A lightweight text templating library written in C# which can be a drop-in replacement for string.Format

Simple library for checking the architecture of C# code with a fluent API.

AutoFixture is an open source framework for .NET designed to minimize the 'Arrange' phase of your unit tests

A behaviour driven testing and reporting framework!

A simple and sane fake data generator for C#. Based on and ported from the famed faker.js.

Canopy is a free, open source F# web automation and testing framework

Perform a deep compare of any two .NET objects using reflection. Shows the differences between the two objects.

Random testing library for C#. Including concurrency, causal profiling, regression and performance testing.

A smooth testing framework for F# with tests as values. Unit testing, property based testing, performance testing and stress testing.

Use plain C# syntax in assertions that include both the expression expression and subexpression values in the failure message.

The easy mocking library for .NET https://fakeiteasy.github.io

A set of .NET extension methods that allow you to more naturally specify the expected outcome of a TDD or BDD-style test [Source Available] [Free for OSS]

Random Testing for .NET.

Machine.Specifications (MSpec) is a context/specification framework that removes language noise and simplifies tests.

The most popular and friendly mocking framework for .NET

Very simple load testing framework for Pull and Push scenarios. It's 100% written in F# and targeting .NET Core and full .NET Framework.

An automated continuous & concurrent testing tool for Visual Studio. [$]

NFluent is an assertion library which aims to fluent your .NET TDD experience.

A lightweight .NET framework that makes integration tests fully isolated by orchestrating reusable infrastructures and environments, auto-resetting between tests. TestContainers and SQL Server built-in support. Based on XUnit.

A friendly substitute for .NET mocking frameworks

A unit-testing framework for all .NET languages

AI-powered Test Automation Dashboard. Acquire, aggregate and analyze test reports to ascertain release health.

SecTester is a new tool that integrates Bright enterprise-grade scan engine directly into your integration or e2e tests. [Proprietary] [Free]

Shouldly is an assertion framework which focuses on giving great error messages when the assertion fails while being simple and terse.

A snapshot testing tool for .NET Core and .NET Framework

Mutation testing for .NET Core projects

A library to support tests with throwaway instances of Docker containers for all compatible .NET Standard versions.

Verification tool to enable simple approval of complex models and documents.

A free, open source, community-focused unit testing tool for the .NET Framework.

A faster, better and more stable redis desktop manager [GUI client], compatible with Linux, Windows, Mac. What's more, it won't crash when loading massive keys.

A software simulator of HSM and smartcard simulator with HTML UI, REST API and PKCS#11 interface.

Build status notifications for TFS/Jenkins/Travis/Appveyor. Cross-platform desktop app based on .NET Core and Electron. [Free version available][Proprietary]

An opinionated code formatter for c# that is based on the Prettier printing process.

Fast and reliable multipart downloader with asynchronous progress events for .NET applications.

Fake REST API for prototyping or as a CRUD Back End. No need to define types, uses dynamic typing. Data is stored to a single JSON file. Has authentication, WebSocket notifications, async long running operations, random generation for errors/delays and experimental GraphQL support.

Fast deep cloning library for .NET 8+. Zero-config, works out of the box.

The free web debugging proxy for any browser, system or platform [Proprietary] [$] [Free Trial available]

A blazing fast JSON formatter and validator that won't share JSON with a server.

API mock server with fast setup, useful to simulate HTTP responses, leveraging ASP.NET Core features, built-in fake data generation and C# scripting engine powered by Roslyn scripting API.

A powerful tool for managing networks and troubleshoot network problems!

A high performance multipart downloader with many features such as pause/resume support, asynchronous progress, and throttling.

Blog writer which integrated with WordPress, Blogger, et. al. Open Live Writer makes it easy to write, preview, and post to your blog.

Stack Exchange's Monitoring System

Papercut is an open source (.NET based) test email viewer that runs locally with a built-in SMTP server designed to receive and notify of test email messages.

ShareX is a free and open source program that lets you capture or record any area of your screen and share it with a single press of a key. It also allows uploading images, text or other types of files to over 80 supported destinations you can choose from.

STranslate is a ready-to-go translation ocr tool developed with WPF.

Makes life working with units of measurement just a little bit better.

YARP is a reverse proxy toolkit for building fast proxy servers in .NET using the infrastructure from ASP.NET and .NET.

Lean Engine is an open-source fully managed C# algorithmic trading engine built for desktop and cloud usage. https://www.quantconnect.com/lean/

Trading and algorithmic trading open source platform (stock markets, forex, bitcoins and options). https://stocksharp.com

Automated web testing full featured framework based on Selenium WebDriver.

FlaUI is a .NET library which helps with automated UI testing of Windows applications (Win32, WinForms, WPF, Store Apps, ...).

Introspect and automate third-party Windows / VC++ applications without needing its source code.

Puppeteer Sharp is a .NET port of the official Node.JS Puppeteer API.

Contributions to Puppeteer Sharp that provides a convenient way to write readable and robust browser tests.

View Entity Framework Core query plan directly in Visual Studio.

A set of extensions to Visual Studio Professional (and above) which improves developer productivity.

Developer Productivity Tool for Visual Studio [$]

A collection of 500+ analyzers, refactorings and fixes for C#, powered by Roslyn

SonarLint is a free, open source Visual Studio 2017, 2019 and 2022 extension that provides on-the-fly feedback to developers on new bugs and quality issues in C#, VB.NET, C/C++, TypeScript and JavaScript.

Visual Studio tab manager with multiple tab rows, tab coloring and tab grouping. [$]

Color highlighting for Build, Find and Debug output windows. Custom match patterns and colors can be added.

VIM in Visual Studio

Modular extensions for the WPF DataGrid control, like filtering, additional column events, extended star-size column behavior, and more...

Listen Global keyboard / mouse events. simple to use. for Windows UI applications (WPF, MAUI, Avalonia)

A rich collection of controls, components and utilities for creating WPF applications

WPF is a .NET Core UI framework for building Windows desktop applications.

HTML5, CSS3 and JS web browser powered by Chromium, for WinForms and WPF

A full featured .NET web-browser built using C# and CefSharp

Coalesce is a framework for rapid-development of ASP.NET Core web applications.

Modern and powerful back-end framework under ASP.NET Core.

MVVM framework for people who don't like to write JavaScript, with OWIN and ASP.NET Core support and a free extension for Visual Studio 2015 and 2017.

Functional (F#) ASP.NET Core micro framework for building rich web applications

Framework/library/web server that makes you cry tears of joy after finishing your project ahead-of-time when you look at the beautiful code you've written in F#.

Web server built on Mono and cross-platform

A lightweight, embeddable web server for quickly creating REST APIs

Web server Library in .NET Core. Powerfully Simple, Blazingly Fast and Build-in components (API REST, JWT, Websockets, self-serialization, Opentelemetry).

Provides a great set of tools for you to build real-time applications on the Microsoft.NET plattform and much more. [$]

Library for ASP.NET developers that makes it incredibly simple to add real-time web functionality to your applications

SuperSocket is a light weight extensible socket application framework

A C# implementation of the WebSocket protocol client and server

A multiplatform wrapper over native C# class ClientWebSocket with built-in reconnection and error handling.

A tool to turn any app into a native Windows service with powerful configuration and management options (a modern alternative to NSSM and WinSW).