America's Army

Offiicial game to the American Army, kick ass fps. Requires training for things, so people may not be arsed to go ahead. Account must be made. 650mb download or if in US you can mail order a disk or goto recruiting station.

Legend of Mir
Legend of Mir, mmorpg. You have to pay for it after level 20 unless you find a private server so you can get better items more exp higher levels and not pay (better then official although not as many people)

I would go into more depth, but its 5:20a.m.