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.
|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