I'll be adding some images later. You can see some excellent videos if you want to see what the game looks like. For free this is excellent.
Stunt Rally
Open source racing game with a track editor. It focuses on closed rally tracks with possible stunt elements (jumps, loops, pipes). You can drive in Single-Player mode racing against the clock or completing championships. There is also an online Multi-Player mode.
Video:
http://www.youtube.com/watch?v=-KDZGnM0jDM (v1.0 Gameplay)
http://www.youtube.com/watch?v=enfDby6B_3I (v1.2 Gameplay)
http://www.youtube.com/watch?v=ddboRq1MMMA (v1.4 Gameplay)
http://www.youtube.com/watch?v=uwQnUqssGmE (v1.5 multiplayer)
Download: