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Open source projects and samples from Microsoft
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Open Source at Microsoft

Get Involved

Right now, open communities are building amazing software together, and there are excellent "good first issue" opportunities, if you're looking to get involved.

Visit opensource.microsoft.com to learn more!

Microsoft projects adopt the Microsoft Open Source Code of Conduct. For more information see the Code of Conduct FAQ.

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  1. vscode vscode Public

    Visual Studio Code

    TypeScript 180k 36.8k

  2. TypeScript TypeScript Public

    TypeScript is a superset of JavaScript that compiles to clean JavaScript output.

    TypeScript 107k 13.2k

  3. PowerToys PowerToys Public

    Microsoft PowerToys is a collection of utilities that help you customize Windows and streamline everyday tasks

    C# 126k 7.5k

  4. terminal terminal Public

    The new Windows Terminal and the original Windows console host, all in the same place!

    C++ 101k 9k

  5. semantic-kernel semantic-kernel Public

    Integrate cutting-edge LLM technology quickly and easily into your apps

    C# 26.8k 4.4k

Repositories

Showing 10 of 7440 repositories
  • openvmm Public

    Home of OpenVMM and OpenHCL

    microsoft/openvmm’s past year of commit activity
    Rust 1,782 MIT 161 182 (8 issues need help) 62 Updated Dec 12, 2025
  • mscclpp Public

    MSCCL++: A GPU-driven communication stack for scalable AI applications

    microsoft/mscclpp’s past year of commit activity
    C++ 443 MIT 76 11 22 Updated Dec 12, 2025
  • onnxscript Public

    ONNX Script enables developers to naturally author ONNX functions and models using a subset of Python.

    microsoft/onnxscript’s past year of commit activity
    Python 413 MIT 94 226 (1 issue needs help) 38 Updated Dec 12, 2025
  • mcp Public

    Catalog of official Microsoft MCP (Model Context Protocol) server implementations for AI-powered data access and tool integration

    microsoft/mcp’s past year of commit activity
    C# 2,292 MIT 316 230 (45 issues need help) 51 Updated Dec 12, 2025
  • typespec Public
    microsoft/typespec’s past year of commit activity
    Java 5,485 MIT 323 986 (3 issues need help) 45 Updated Dec 12, 2025
  • ado-npm-auth Public

    This package can automatically use the azureauth CLI to fetch tokens and update a user's .npmrc file for authenticating to Azure DevOps npm feeds.

    microsoft/ado-npm-auth’s past year of commit activity
    TypeScript 18 MIT 14 11 10 Updated Dec 12, 2025
  • SimpleL7Proxy Public

    Container based solution to do performance based proxy requests to APIM backends.

    microsoft/SimpleL7Proxy’s past year of commit activity
    C# 9 MIT 7 0 2 Updated Dec 12, 2025
  • Agent-Christine Public

    Build your own agent for Marketplace assistance

    microsoft/Agent-Christine’s past year of commit activity
    4 MIT 2 0 0 Updated Dec 12, 2025
  • clarity Public

    A behavioral analytics library that uses dom mutations and user interactions to generate aggregated insights.

    microsoft/clarity’s past year of commit activity
    TypeScript 2,548 MIT 260 234 (1 issue needs help) 20 Updated Dec 12, 2025
  • go Public

    The Microsoft build of Go is a modified version of Go that can build FIPS compliant applications that satisfy internal Microsoft policies.

    microsoft/go’s past year of commit activity
    Go 405 BSD-3-Clause 38 138 4 Updated Dec 12, 2025
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