Rally-Sport

Rally-Sport is a "cult classic" vector-graphics-based 3D rally racing game. It's technically impressive, and was created by a single developer. One of its big features is a track editor to make your own tracks (see the extra files to download it). The race begins, and you race one-on-one against the computer controlled car around the track. The graphics are impressive considering that no 3D card is necessary, however the demo/beta nature of the software is evident since there is not a lot of gameplay to go along with the admittedly gorgeous visuals (for a DOS game from 1996).