Simcar is a car simulation game based on simple3d - application for rendering 3D objects in real time using SDL.
There is new project named Skunks. It is replacement for Simcar. Skunks has version 4.0.0 (2012-04-07)
This doesn't seem like it's a "game" per se, but a proof of concept of the simple3d library. The graphics remind me of the 1989 game Vette! (screenshots) and the physics engine is limited to say the least. Still, it's fun for a coffee break game.