Projects under the stewardship of the .NET Foundation currently include the .NET Compiler Platform ("Roslyn") as well as the ASP.NET family of projects, .NET Core, Xamarin Forms along with popular .NET open source frameworks like xUnit and Reactive Extensions. We’re actively engaged in supporting open source projects in the .NET ecosystem, you can learn more about our work or see our blog for the latest announcements.

Pick a project below to learn more about it and how to contribute:

  • orleans

    Orleans - Distributed Virtual Actor Model

  • SignalR

    Incredibly simple real-time web for ASP.NET Core

  • System.Drawing

    Mono open source ECMA CLI, C# and .NET implementation.

  • xamarin-macios

    Bridges the worlds of .NET with the native APIs of Mac, iOS, tvOS, and watchOS.

  • xamarin-android

    Xamarin.Android provides open-source bindings of the Android SDK for use with .NET managed languages such as C#

  • Prism

    Prism is a framework for building loosely coupled, maintainable, and testable XAML applications in WPF, Windows 10 UWP, and Xamarin Forms.

  • Docs

    Documentation for ASP.NET and ASP.NET Core

  • Umbraco-CMS

    The simple, flexible and friendly ASP.NET CMS used by more than 400.000 websites

  • wcf

    This repo contains the client-oriented WCF libraries that enable applications built on .NET Core to communicate with WCF services.

  • Embeddinator-4000

    Tools to turn .NET libraries into native libraries that can be consumed on Android, iOS, Mac, Linux and other platforms.

  • corert

    This repo contains CoreRT, a .NET Core runtime optimized for AOT (ahead of time compilation) scenarios, with the accompanying .NET Native compiler toolchain.

  • Identity

    ASP.NET Core Identity is the membership system for building ASP.NET Core web applications, including membership, login, and user data.

  • llilc

    This repo contains LLILC, an LLVM based compiler for .NET Core. It includes a set of cross-platform .NET code generation tools that enables compilation of MSIL byte code to LLVM supported platforms.

  • corefxlab

    This repo is for experimentation and exploring new ideas that may or may not make it into the main corefx repo.

  • docfx

    Tools for building and publishing API documentation for .NET projects

  • monodevelop

    MonoDevelop is a cross platform IDE mostly aimed at Mono/.NET developers

Read about our:

Services for Projects
Process for joining the .NET Foundation
  • 481 Repositories
  • 47214 Forks
  • 10088 Contributors