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Accessibility Insights

Accessibility Insights is a suite of open source tools that help developers find and fix accessibility issues in Web, Windows and Android applications.

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Azure SDKs

The Azure SDKs are a set of libraries focused on ensuring that developers around the world have a first-class experience leveraging Azure services in their applications.

Visit the Azure SDK page


Blazor lets you build interactive web UIs using C# instead of JavaScript

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Bond is an open-source, cross-platform framework for working with schematized data.

Browse the Bond repo

Windows Calculator

The Windows Calculator app is a modern Windows app written in C++ and C# that ships pre-installed with Windows. The app provides standard, scientific, and programmer calculator functionality, as well as a set of converters between various units of measurement and currencies.

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CCF is a framework for building secure, highly available, performant blockchain and multi-party applications.

Learn more about CCF
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CNAB is a spec for packaging distributed apps

Learn more about CNAB

Component Detection

Component Detection is a Software Composition Analysis (SCA) tool designed to be used at build-time to determine all dependencies pulled into a build.

Learn more about Component Detection
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An event-driven, portable runtime for building microservices on cloud and edge

Get involved in Dapr
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Decentralized & Collaborative AI on Blockchain

Decentralized & Collaborative AI on Blockchain is a framework to host and train publicly available machine learning models. Ideally, using a running inference using a model stored in a smart contract is free.

Hodl that model
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.NET is Microsoft's open-source, general-purpose development framework for building cross-platform apps.

About .NET
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A collection of technologies built on Web Components and modern Web Standards, designed to help you efficiently tackle some of the most common challenges in website and application design and development

About FAST
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Fluent UI

A collection of Fluent Design UX frameworks for creating beautiful, cross-platform apps that share code, design, and interaction behavior.

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Fluid Framework

Fluid Framework is a collection of client libraries for distributing and synchronizing shared state.

Learn more about Fluid Framework


Forge is a generic low-code framework built on a config-driven tree walker.

Learn more about Forge
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Graph Engine

Graph Engine is an open-source distributed in-memory graph processing engine.

About Graph Engine
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Kubernetes Event-driven Autoscaling (KEDA)

Application autoscaling made simple on Kubernetes

Learn more about KEDA

Language Server Protocol

Defines the protocol used between an editor or IDE and a language server to provide useful features

Learn more about the Language Server Protocol
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ONNX Runtime

ONNX Runtime is a cross-platform inferencing and training accelerator compatible with many popular ML/DNN frameworks, including PyTorch, TensorFlow/Keras, scikit-learn, and more

About ONNX Runtime
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Open Education Analytics (OEA)

Open Education Analytics collaborates with education systems across the world to develop modern data intelligence capabilities.

Get Involved in Open Education Analytics

Open Enclave SDK

Open Enclave is an open source C SDK for creating a single unified enclave abstraction to build Trusted Execution Environment (TEEs) based applications.

Browse the Open Enclave repo

Open Service Mesh

Open Service Mesh (OSM) is a lightweight and extensible cloud native service mesh

About Open Service Mesh


pg_auto_failover is an extension and service for PostgreSQL that monitors and manages automated failover for a Postgres cluster

About pg_auto_failover
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Playwright is a framework for Web Testing and Automation. It allows testing Chromium, Firefox and WebKit with a single API.

About Playwright
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PowerShell is a cross-platform task automation and configuration management framework, consisting of a command-line shell and scripting language.

About PowerShell Download PowerShell from Microsoft Store
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Microsoft PowerToys is a set of utilities for power users to tune and streamline their Windows experience for greater productivity.

Learn about PowerToys Download PowerToys from Microsoft Store
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PR Metrics

An Azure DevOps build task and GitHub Action that augments Azure DevOps and GitHub pull request titles, letting reviewers quickly determine PR size and test coverage.

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Project Mu

Project Mu is a modular adaptation of TianoCore's edk2 (UEFI BIOS reference) tuned for building modern devices using a scalable, maintainable, and reusable pattern

About Project Mu
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Helping developers build Progressive Web Apps (PWAs) and package them for app stores like Google Play, Microsoft Store, MacOS Store, and more.

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SONiC is an open source network operating system based on Linux that runs on switches from multiple vendors and ASICs

Learn more about SONiC
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Windows Terminal

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

Check out the Terminal source code Download Windows Terminal from Microsoft Store
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TypeScript is an open-source and cross-platform language that builds on JavaScript by adding static types and type-checking

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VFS for Git

The Virtual Filesystem for Git (formerly GVFS) is an open source system that enables Git to operate at enterprise-scale

Visit the VFS for Git page

Virtual Kubelet

Virtual Kubelet is an open source Kubernetes kubelet implementation

Get involved in Virtual Kubelet
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Visual Studio Code

Visual Studio Code is a free, highly customizable code editor that is based on an open-source codebase and runs on Linux, macOS, and Windows.

Explore Visual Studio Code Download Visual Studio Code from Microsoft Store

YARN Federation

YARN Federation allows to operate several YARN clusters and tie them together transparently

Learn more about YARN

Explore Microsoft projects

Microsoft engineers and community members maintain thousands of GitHub repos: everything from complete samples, to product SDKs, to entire products.