Open.
Collaborative.
Flexible.

Open Source enables Microsoft products and services to bring choice, technology and community to our customers.

Projects

Some of the most popular developer tools, frameworks and experiences in the world are built around open communities. Here are a few featured Microsoft projects of note.

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.

CNAB

CNAB is a spec for packaging distributed apps

Open Education Analytics (OEA)

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

Microsoft's communities Get involved

We are building value together and welcome everyone to participate. Together, in the open, it's an exciting time to use technology to build hacks, apps, and services.

Happening now
Find a "good first issue"
Featured projects

Learn from our enterprise-scale approach Our program & tools

We have worked to develop a strong open source program over the past decade, making it easy for every team at Microsoft to choose to use, contribute to, and release open source software.

Many of our tools and approaches are available for you to learn from, too.

Our program
Our tools
The ecosystem we support

Microsoft Open Source Updates

Innovate faster and more securely with open source on Azure

Build on a highly secure cloud platform designed to protect your data and business assets, including proactive, comprehensive compliance coverage. Gain the flexibility to move your app anywhere. Operate seamlessly and elastically, on-premises, in hybrid or multicloud environments, or at the edge.

Learn more about open source on Azure

Community Resources

We welcome you to our open communities. Please check out our Code of Conduct and one-time Contributor License Agreement to help us all participate with care.