http://www.oovee.co.uk/games/upcoming-games/spin-tires/Probably the best realistic off-road game ever. They started a kickstarter to make the game into an actual game rather than a Tech Demo. Download it for free and try it out, it's so sick. Sadly there are only 2 vehicles, they show other vehicles but those are the older versions.
The game is only 80MB by the way.
