There is no such thing as a free lunch, but there is such a thing as a free game. We're only focusing on PC games, so apologies if you were expecting a smart phone game.
Free To Play, Team Fortress 2, League of Legends, Planetside 2, World of Tanks, Path of Exile, Tribes Ascended, Smite, Star Wars, The Old Republic, Dota 2, Hawken, Countdown, List, Top 10, best, greatest