StuntMoto

Game aim: Do wheelies, stoppies and burnouts with a motorcycle to get
as many points as you can. To make wheelies, accelerate and use clutch
and rearbrake to control your angle. To make a stoppie, simply press front
brake. To make burnouts, press front brake and accelerate.

Game modes: 2 minute time attack, free roam and online multiplayer.
-2 bikes
-4 maps
-7 driving positions/tricks

Download:
http://www.stuntmoto.org/files/stuntmoto_008.zip (71MB)

Website:
http://www.stuntmoto.org

Screenshots:
http://www.stuntmoto.org/screenshots.html

The game is free, media is under creative commons license (you can use them in your game) and the source code is included.