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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 181k 37.4k

  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# 128k 7.6k

  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# 27.1k 4.4k

Repositories

Showing 10 of 7496 repositories
  • LightGBM Public

    A fast, distributed, high performance gradient boosting (GBT, GBDT, GBRT, GBM or MART) framework based on decision tree algorithms, used for ranking, classification and many other machine learning tasks.

    microsoft/LightGBM’s past year of commit activity
    C++ 18,018 MIT 3,978 427 (10 issues need help) 48 Updated Jan 17, 2026
  • CsWinRT Public

    C# language projection for the Windows Runtime

    microsoft/CsWinRT’s past year of commit activity
    C# 619 MIT 122 215 25 Updated Jan 17, 2026
  • winget-pkgs Public

    The Microsoft community Windows Package Manager manifest repository

    microsoft/winget-pkgs’s past year of commit activity
    PowerShell 10,137 MIT 5,924 1,069 422 Updated Jan 17, 2026
  • automated-brain-explanations Public

    Generating and validating natural-language explanations for the brain.

    microsoft/automated-brain-explanations’s past year of commit activity
    Jupyter Notebook 62 MIT 10 3 0 Updated Jan 17, 2026
  • AI-in-One-Dashboard Public

    AI-in-One Dashboard Power BI template for comprehensive AI usage analytics

    microsoft/AI-in-One-Dashboard’s past year of commit activity
    PowerShell 9 MIT 5 0 0 Updated Jan 17, 2026
  • simplechat Public

    Secure AI conversations with documents, video, audio, and more. Personal workspaces for focused context, group spaces for shared insight. Classify docs, reuse prompts, and extend with modular features.

    microsoft/simplechat’s past year of commit activity
    Python 108 90 135 10 Updated Jan 17, 2026
  • PhiCookBook Public

    This is a Phi Family of SLMs book for getting started with Phi Models. Phi a family of open sourced AI models developed by Microsoft. Phi models are the most capable and cost-effective small language models (SLMs) available, outperforming models of the same size and next size up across a variety of language, reasoning, coding, and math benchmarks

    microsoft/PhiCookBook’s past year of commit activity
    Jupyter Notebook 3,652 MIT 474 0 4 Updated Jan 17, 2026
  • STL Public

    MSVC's implementation of the C++ Standard Library.

    microsoft/STL’s past year of commit activity
    C++ 10,952 1,608 530 (3 issues need help) 28 Updated Jan 17, 2026
  • onnxruntime Public

    ONNX Runtime: cross-platform, high performance ML inferencing and training accelerator

    microsoft/onnxruntime’s past year of commit activity
    C++ 19,007 MIT 3,654 829 378 Updated Jan 17, 2026
  • testfx Public

    This repository holds the source code of Microsoft.Testing.Platform (MTP), a lightweight alternative to VSTest, as well as MSTest adapter and framework.

    microsoft/testfx’s past year of commit activity
    C# 976 MIT 291 204 15 Updated Jan 17, 2026
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