rFactor

rFactor is a computer racing simulator that lets you drive all sorts of four-wheeled vehicles, from street cars to open-wheel race cars of any era. rFactor aimed to be the most accurate racing simulator of its time. After its release in November 2005, rFactor didn't have much competition on the market, but it offered many technical advances in tire modeling, complex aerodynamics and a physics engine with 15 degrees of freedom.