Entity framework team today announced a new level of cooperation with community by releasing Entity Framework on CodePlex under an Open Source license (Apache 2.0). This license provides opportunity to get the code, modify the code and use it in our own hobby, open source or commercial projects (for further license details check the license page). We can also contribute back to the repository - Arthur Vickers wrote very nice series for contributors. This move may raise some questions about support of Entity Framework. There will still be the main branch maintained by Microsoft which will be used for official releases with full support. Entity framework follows move already made for example by ASP.NET MVC team. We can only hope that other teams will follow this decision. I would like to see WCF under an Open source license as well (it is the top request in WCF UserVoice). Open sourcing code can make .NET APIs only better.