GNU Kart is a kart racing game for GNU using characters based on GNU/Free Software stuff.
There are currently three characters that have a (incomplete) 3D model to them: GNU, guile, and icecat.
You have to run it from the command line and it only lets you go through one lap and then quits, but the computer characters will drive around the track nicely.
Get it at http://alpha.gnu.org/gnu/gnukart/gnukart-0.3.0.tar.gz
Or get the development branch using Bazaar:
bzr branch http://bzr.savannah.gnu.org/r/gnukart
Send any comments to bug-gnukart@gnu.org (which I just created so expect uncertainty).
SpeedX is now GNU Kart. The "X" in the name "SpeedX" referred to the X window system, which especially made sense because it heavily used X11 libraries. GNU Kart doesn't use X11 libraries directly, and mostly uses OpenGL.
If you check out the latest source in Bazaar, you will see that I am testing a track format that is based on spheres of different radii connected by edges that form tubes that tell which edge a player is traveling along and which sphere they are heading toward.
I use Bazaar personally but have waited to put anything online because I didn't want to use my personal web space. SpeedX uses Bazaar and the current source of SpeedX can now be browsed at http://bzr.savannah.gnu.org/lh/speedx
or downloaded by
bzr branch http://bzr.savannah.gnu.org/r/speedx