Societe Turbo is free & open project.
Here you can download latest versions of a game:
Linux, Windows & Source.
Screenshot gallery of the game.
Societe Turbo Manifesto explains the game priciples, shows the current #gamedev state & further plans.
See full collection of Turbo II Series – #51-120
GAMEDEV Page shows current state of game development in case of car modelling. Special table displays how many cars are prepared.