The cross-platform free open source motor-sport simulator, Speed Dreams, released new 2.4.1 version a few days ago.
Speed Dreams is a fork of the famous Open Racing Car Simulator TORCS, and it features high-quality 3D graphics and an accurate physics engine. The last 2.4.0 release introduced a in-game download manager, allowing to easily fetch new cars and tracks from a configurable repositories.
TORCS, The Open Racing Car Simulator recently released versiono 1.3.5. The most important changes in 1.3.5 are:
the ability to modify/store/load car setups during practice and qualifying sessions (screen reachable when you hit escape, “Car Setup, Restart” or during a pit stop, “Setup”)
improved content (totally reworked racetrack e-track-2, improved e-track-6 and wheel-2)
the ability of robots to change the car setup during a pit stop
new Robottools API calls for handling car setups
improvements to the simulation engine (1.5 way LSD, third element)
adjustments to the car categories and physical models