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The "easy-to-use" multi-platform 3D engine Unity will support Linux, but there is no release date, yet.
Posted by joeka on Mar 10th, 2011
Unity enables developers to easily build their game for specific (multiple) platforms.
A user in the unity forums discovered, that an export option for a LinuxPlayer is in development.
A member of Unity Technologies then confirmed their plans:
Vectrex, it seems you've got us on this one
We are in fact working on Linux support to be released initially as a preview feature. We have no set release date yet.