Repositories list

• roslyn

  Public
  The Roslyn .NET compiler provides C# and Visual Basic languages with rich code analysis APIs.

  visual-studiocsharproslyn+ 2

  visual-studiocsharproslynvisual-basichacktoberfest

  C#

  •

  MIT License

  •4.2k4.2k forks•20k20k stars•5.5k5.5k issues•658658 pull requests•Updated Apr 25, 2026Apr 25, 2026

• roslyn-analyzers

  Public
  hacktoberfest

  hacktoberfest

  481481 forks•1.7k1.7k stars•1.1k1.1k issues•66 pull requests•Updated Apr 25, 2026Apr 25, 2026

• efcore

  Public
  EF Core is a modern object-database mapper for .NET. It supports LINQ queries, change tracking, updates, and schema migrations.

  c-sharpormdatabase+ 6

  c-sharpormdatabaseentity-frameworkdotnet-coredotnet-standardhacktoberfestdotnet-frameworkaspnet-product

  C#

  •

  MIT License

  •3.4k3.4k forks•15k15k stars•2.4k2.4k issues•3737 pull requests•Updated Apr 25, 2026Apr 25, 2026

• dotnet-api-docs

  Public
  .NET API reference documentation (.NET 5+, .NET Core, .NET Framework)

  hacktoberfest

  hacktoberfest

  C#

  •

  Other

  •1.7k1.7k forks•906906 stars•1.5k1.5k issues•9999 pull requests•Updated Apr 25, 2026Apr 25, 2026

• macios

  Public
  .NET for iOS, Mac Catalyst, macOS, and tvOS provide open-source bindings of the Apple SDKs for use with .NET managed languages such as C#

  macosiosxamarin+ 4

  macosiosxamarincsharpdotnettvoswatchos

  C#

  •

  Other

  •565565 forks•2.9k2.9k stars•452452 issues•4747 pull requests•Updated Apr 25, 2026Apr 25, 2026

• diagnostics

  Public
  This repository contains the source code for various .NET Core runtime diagnostic tools and documents.

  C++

  •

  MIT License

  •394394 forks•1.3k1.3k stars•254254 issues•2929 pull requests•Updated Apr 25, 2026Apr 25, 2026

• skills

  Public
  Repository for skills to assist AI coding agents with .NET and C#

  agent-skills

  agent-skills

  C#

  •

  MIT License

  •106106 forks•1.4k1.4k stars•4343 issues•3434 pull requests•Updated Apr 25, 2026Apr 25, 2026

• BenchmarkDotNet

  Public
  Powerful .NET library for benchmarking

  c-sharpbenchmarkingbenchmark+ 4

  c-sharpbenchmarkingbenchmarkperformancecsharpdotnethacktoberfest

  C#

  •

  MIT License

  •1k1k forks•11k11k stars•149149 issues•3838 pull requests•Updated Apr 25, 2026Apr 25, 2026

• runtime

  Public
  .NET is a cross-platform runtime for cloud, mobile, desktop, and IoT apps.

  dotnethelp-wantedhacktoberfest

  dotnethelp-wantedhacktoberfest

  C#

  •

  MIT License

  •5.4k5.4k forks•18k18k stars•7.8k7.8k issues•415415 pull requests•Updated Apr 25, 2026Apr 25, 2026

• dotnet

  Public
  Home of .NET's Virtual Monolithic Repository which includes all the code needed to build the .NET SDK.

  dotnetmonorepo

  dotnetmonorepo

  C#

  •

  MIT License

  •282282 forks•1.1k1.1k stars•134134 issues•4949 pull requests•Updated Apr 25, 2026Apr 25, 2026

• windowsdesktop

  Public
  Shell

  •

  MIT License

  •6565 forks•207207 stars•1313 issues•00 pull requests•Updated Apr 25, 2026Apr 25, 2026

• winforms

  Public
  Windows Forms is a .NET UI framework for building Windows desktop applications.

  winformsdesktophelp-wanted+ 2

  winformsdesktophelp-wantedwindows-formshacktoberfest

  C#

  •

  MIT License

  •1.1k1.1k forks•4.8k4.8k stars•720720 issues•8989 pull requests•Updated Apr 25, 2026Apr 25, 2026

• maui

  Public
  .NET MAUI is the .NET Multi-platform App UI, a framework for building native device applications spanning mobile, tablet, and desktop.

  androidmicrosoftios+ 10

  androidmicrosoftiosmulti-platformmobiledotnetdesktopuser-interfacehacktoberfestmaui+ 3

  C#

  •

  MIT License

  •1.9k1.9k forks•23k23k stars•3.8k3.8k issues•320320 pull requests•Updated Apr 25, 2026Apr 25, 2026

• deployment-tools

  Public
  This repo contains the code to build the .NET deployment tools and installers for all supported platforms, as well as the sources to .NET deployment tools.

  C#

  •

  MIT License

  •6868 forks•208208 stars•3434 issues•11 pull request•Updated Apr 25, 2026Apr 25, 2026

• fsharp

  Public
  The F# compiler, F# core library, F# language service, and F# tooling integration for Visual Studio

  visual-studiotoolscompiler+ 5

  visual-studiotoolscompilerfsharpfunctional-programmingdotnetnetcoreintellisense

  F#

  •

  MIT License

  •858858 forks•4.3k4.3k stars•1.2k1.2k issues•9191 pull requests•Updated Apr 25, 2026Apr 25, 2026

• emsdk

  Public
  Emscripten SDK

  Shell

  •

  Other

  •807807 forks•1717 stars•00 issues•55 pull requests•Updated Apr 25, 2026Apr 25, 2026

• sdk

  Public
  Core functionality needed to create .NET Core projects, that is shared between Visual Studio and CLI

  clivisual-studiosdk+ 1

  clivisual-studiosdkdotnet

  C#

  •

  MIT License

  •1.2k1.2k forks•3.1k3.1k stars•2.7k2.7k issues•229229 pull requests•Updated Apr 25, 2026Apr 25, 2026

• razor

  Public
  Compiler and tooling experience for Razor ASP.NET Core apps in Visual Studio and VS Code.

  aspnethacktoberfest

  aspnethacktoberfest

  C#

  •

  MIT License

  •238238 forks•709709 stars•636636 issues•3434 pull requests•Updated Apr 25, 2026Apr 25, 2026

• dotnet-monitor

  Public
  This repository contains the source code for .NET Monitor - a tool that allows you to gather diagnostic data from running applications using HTTP endpoints

  C#

  •

  MIT License

  •123123 forks•707707 stars•127127 issues•33 pull requests•Updated Apr 25, 2026Apr 25, 2026

• templating

  Public
  This repo contains the Template Engine which is used by dotnet new

  dotnetdotnet-template

  dotnetdotnet-template

  C#

  •

  MIT License

  •396396 forks•1.7k1.7k stars•209209 issues•1414 pull requests•Updated Apr 25, 2026Apr 25, 2026

• aspnetcore

  Public

  dotnet/aspnetcore’s past year of commit activity
  ASP.NET Core is a cross-platform .NET framework for building modern cloud-based web applications on Windows, Mac, or Linux.

  dotnetaspnetcorehelp-wanted+ 1

  dotnetaspnetcorehelp-wantedhacktoberfest

  C#

  •

  MIT License

  •11k11k forks•38k38k stars•3.6k3.6k issues•275275 pull requests•Updated Apr 25, 2026Apr 25, 2026

• installer

  Public
  .NET SDK Installer

  435435 forks•1.3k1.3k stars•2323 issues•66 pull requests•Updated Apr 25, 2026Apr 25, 2026

• dnceng

  Public
  .NET Engineering Services

  C#

  •

  MIT License

  •3333 forks•3131 stars•2121 issues•33 pull requests•Updated Apr 25, 2026Apr 25, 2026

• dnceng-shared

  Public
  Shared libraries used by arcade-services, helix-services

  C#

  •

  MIT License

  •1313 forks•1111 stars•00 issues•22 pull requests•Updated Apr 25, 2026Apr 25, 2026

• NuGet.BuildTasks

  Public
  The build tasks used to pick up package content from project.lock.json.

  PowerShell

  •

  MIT License

  •6262 forks•4747 stars•1919 issues•11 pull request•Updated Apr 25, 2026Apr 25, 2026

• arcade

  Public
  Tools that provide common build infrastructure for multiple .NET Foundation projects.

  C#

  •

  MIT License

  •385385 forks•720720 stars•420420 issues•3838 pull requests•Updated Apr 25, 2026Apr 25, 2026

• wcf

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

  wcfwcf-client

  wcfwcf-client

  C#

  •

  MIT License

  •574574 forks•1.8k1.8k stars•313313 issues•2929 pull requests•Updated Apr 25, 2026Apr 25, 2026

• install-scripts

  Public
  PowerShell

  •

  MIT License

  •109109 forks•204204 stars•1515 issues•44 pull requests•Updated Apr 25, 2026Apr 25, 2026

• workload-versions

  Public
  PowerShell

  •

  MIT License

  •1818 forks•1313 stars•77 issues•99 pull requests•Updated Apr 25, 2026Apr 25, 2026

• maui-labs

  Public
  Experimental and pre-release tools for .NET MAUI

  androidmicrosoftios+ 10

  androidmicrosoftiosmulti-platformmobileaidotnetmcpdesktopuser-interface+ 3

  C#

  •

  MIT License

  •1212 forks•8383 stars•2525 issues•2323 pull requests•Updated Apr 24, 2026Apr 24, 2026