Live for Speed

LFS S2 is a serious racing simulator. No arcade modes, no steering aids - YOU have to do the driving. You can race alone or against the AI, but the real fun is to be found online, in multiplayer mode.
Widescreen and triplehead support has been in LFS for a quite a long time now. The coder of the game has a triplehead setup himself so support should and is flawless.