Assetto Corsa Community forums | Kunos Simulazioni.
Automobilista community forums | Reiza Studios
DiRT community forums | Codemasters
The official Formula 1 Game community forums | Codemasters
Forza Horizon community forums | Playground Games
Forza Motorsport community forums | Turn 10
GTL community forums | SimBin Studios
GTR Series community forums | Simbin
Gran Turismo community forums | Polyphony Digital
GRID community forums | Codemasters
MotoGP community forums | Milestone
Community forum for the funny car game of Amistech Games
Project CARS community forums | Slightly Mad Studios
R3E community forums | Sector3 Studios (formerly SimBin). Also the forum for ADAC GT, DTM and WTCC Experience discussions.
rFactor community forums | Image Space Incorporated & Studio 397
Wreckfest (formerly Next Car Game) community forums | Bugbear Entertainment
Discussions for various racing games & simulations without a dedicated forum.