Thousands of Microsoft engineers use, contribute to and release open source every day across every platform, from the cloud to client operating systems, programming languages and more.
Discover Microsoft-released open source
At opensource.microsoft.com you can explore open source that Microsoft teams have released and are collaborating with the broader community of software engineers. Microsoft's open source repositories live on GitHub.
Microsoft Open Source Code of Conduct
The Microsoft Open Source Code of Conduct outlines expectations for participation in Microsoft-managed open source communities, as well as steps for reporting unacceptable behavior.
Microsoft Contributor License Agreements
We appreciate community contributions to code repositories governed by Microsoft. By signing a contribution license agreement, we ensure that the community is free to use your contributions.
An archive of notices and source code for certain third-party components shipped with Microsoft products, in accordance with the corresponding licenses that contain disclosure obligations.
Microsoft + Open Source Marketing
Open dialogue about openness at Microsoft – open source, standards, interoperability, and the people and companies who inspire our commitment.
The .NET Foundation is an independent organization to foster open development and collaboration around the .NET ecosystem. It serves as a forum for community and commercial developers alike to broaden and strengthen the future of the .NET ecosystem by promoting openness and community participation to encourage innovation.