Galactic Vice is a new, SciFi RTS game featuring two races at war. Vital mistakes made by a corrupt human empire lead to a catastrophic war against an alien race--one in which humanity is pushed to the brink of extinction.
Galactic Vice has recently reached a major development milestone, and the developers are looking to expand their team and get additional support.
Although a FREE game, it is a commercially driven project. It has its roots in Linux, and runs on the most common variants (and Windows too).
Official Announcement: http://galacticvice.com/blog/?p=613
Release Notes: http://galacticvice.com/forums/viewtopic.php?f=28&t=191&p=1232#p1232
Demo Video: http://www.youtube.com/watch?v=VAsmedtafJQ