MyPlayCity: Ringed Racing Fun - Two-dimensional top-down racing game. - http://www.myplaycity.com/ringed_racing_fun/
Nitto 1320 Challenge - Free online drag racing simulator from Nitto Tire corporation. - http://www.nitto1320.com/
Race - A 2d arcade overhead car racer for Windows or Linux with computer opponents, music, sound effects, and a track editor. - http://race.sourceforge.net/
BumpRace - Arcade race for Windows, Linux, or BeOS. Get to the finish line without crashing into deadly blocks. - http://user.cs.tu-berlin.de/~karlb/bumprace/
Space Race - A contest in outer space for DOS. - http://qewl.com/spacerace/spacerace.html
Trophy - A 2D car race for Linux. (Open Source, GPL) - http://trophy.sourceforge.net/index.php3
XRally - A Linux clone of the classic Rally X arcade game. You control a blue (good) car, that has to collect yellow flags around a maze-like map, while avoiding the red (bad) cars. (Open Source) - http://www.linuxgames.com/xrally/