Hot off the press is 
the news that id software has released the source-code to their Doom3 remastered BFG edition. Have a look at the code 
here. It seems like Mr. Carmack has back-ported a few nifty things from idTech5, so this is potentially quite useful for 
upcoming idtech4 based FOSS games.
In unrelated news, I am happy to report that we are now hosting the forums for the nice off-road racing game 
StuntRally. Join the discussion 
here.
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| Old StuntRally screenshot, too lazy to find another right now ;) | 
One of the really awesome features of that game is the track-editor by the way... have a look at some awesome video tutorials 
here. Given the Techno-style music in these and the awesome spline-based tracks, I actually think that a 
WipeOut like modification of this game would really rock, join the discussion I started on that 
here :D