[adrianmalacoda]

And by "open source" they mean a proprietary product[0] with "personal" (stripped down and highly restrictive license) and "pro" versions[1], naturally.

The old version (which is on github) is GPLv3 apparently.

[0] http://xenko.com/legal/eula/

[1] https://store-dev.xenko.com/get-xenko