RFactor

From VaafWiki

rFactor is a racing simulation with realistic simulation of tires, suspension and physics.

The simulation supports compeditive multiplayer (including dedicated server), the TrackIR head tracking device, Triplehead resolutions and the custom skinning of vehicles.

It has an active modding community and both the V8 Supercars and the Bathurst Raceway are available making it a particularly attractive simulation for Australian racing simulation fans.

rFactor can be obtained as a retail DVD or purchased online as a download. A trial version featuring one track is available.