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

  • EntityFramework

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

  • core

    Home repository for .NET Core

  • 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, ...).

  • orleans

    Orleans - Distributed Virtual Actor Model

  • SignalR

    Incredibly simple real-time web for ASP.NET Core

  • SignalR

    Incredibly simple real-time web for .NET

  • standard

    This repo is building the .NET Standard

  • 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.

  • 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.

  • Prism

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

  • wcf

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

  • Umbraco-CMS

    The simple, flexible and friendly ASP.NET CMS used by more than 390.000 websites

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