Stunt Rally is a game about rally and stunts (licensed under GPLv3).
It also features a track editor.
You can read the quite big features list here.
There is already over 100 tracks to drive on. Many screenshots of them are located in our gallery.
Current video of gameplay and landscapes in version 2.0:
youtu.be/O5BY8aq2xPE
The homepage is located here:
http://code.google.com/p/vdrift-ogre/
and it has links to downloads, videos, screenshots, etc. as well as project Wiki pages.
And we have a subforum here on FreeGameDev.