Xenko 3D is now available as open source with the MIT permissive license with a completely free runtime and editor. The announcement was made on the Xenko blog with the release of Xenko 3.0.

In addition to the open source transition, Xenko 3.0 includes a new C# project system and video, hair, and skin rendering. You can view the full release notes here. 

Silicon Studio no longer supports Xenko, but members of the Xenko team will continue to work on it independently with the community. 

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Hi everyone! For those who are interested in 3D engines, I strongly recommend that you get acquainted with the  Xenko, 
which the recently became free and open-source MIT. You can take part in its development.
https://gitter.im/xenko3d/xenko
https://twitter.com/xenko3d

Thank you for sharing this unknown information about Xenko. I will begin to inquire more about it!