rFactor

rFactor 2 is a realistic, easily extendable racing simulation that offers the latest in vehicle and race customization, great graphics, outstanding multiplayer and the height of racing realism. It features mixed class road racing with ultra realistic dynamics, an immersive sound environment and stunning graphics. You can race against both AI and other drivers in multi-player mode.

rFactor is a computer racing simulator, designed with the ability to run any type of four-wheeled vehicle from street cars to open wheel cars of any era. rFactor aimed to be the most accurate race simulator of its time. Released in November 2005, rFactor did not have much competition in this market; however it featured many technical advances in tire modeling, complex aerodynamics and a 15 degrees of freedom physics engine.