Great news! Thanks to Luis Anton Rebollo's independent efforts of porting Torque3D to Linux, an open-source version of experimental FPS Revenge Of The Cats: Ethernet would now be able to have native linux support from the very beginning of its development. See related IndieDB news article Help resurrect Revenge Of The Cats: Ethernet as proper open-source project or go directly to the IndieGoGo crowdfunding campaign.
Image: Torque3D template game compiled and running natively on XUbuntu 12.10.