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:

  • corefx

    This repo contains the .NET Core foundational libraries, called CoreFX. It includes classes for collections, file systems, console, XML, async and many others.

  • coreclr

    This repo contains the .NET Core runtime, called CoreCLR, and the base library, called mscorlib. It includes the garbage collector, JIT compiler, base .NET data types and many low-level classes.

  • roslyn

    The .NET Compiler Platform ("Roslyn") provides open-source C# and Visual Basic compilers with rich code analysis APIs.

  • csharplang

    The official repo for the design of the C# programming language

  • core

    Home repository for .NET Core

  • standard

    This repo is building the .NET Standard

  • EntityFramework

    Entity Framework Core is a lightweight and extensible version of the popular Entity Framework data access technology

  • cli

    This repo contains the .NET Core command-line (CLI) tools, used for building .NET Core apps and libraries through your development flow (compiling, NuGet package management, running, testing, ...).

  • Mvc

    ASP.NET Core MVC is a model view controller framework for building dynamic web sites with clean separation of concerns, including the merged MVC, Web API, and Web Pages w/ Razor.

  • 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#

  • IdentityServer3

    OpenID Connect Provider and OAuth 2.0 Authorization Server Framework for ASP.NET 4.x/Katana

  • Docs

    Documentation for ASP.NET and ASP.NET Core

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