Nexuiz has a Steam Free Weekend going on. You can play the game for free on Steam until Sunday at 1pm Pacific Time. In addtion the game is on sale for 75% off. I’ve heard the game has low player counts so maybe it’ll get the numbers up some. I heard it’s a fun game if you do get in a match. They’ve also added Steam workshop support so it’ll be easier to get custom maps. They seriously need to do something like that for Alien Swarm.
Maplestory has been added to the Steam library of Free to Play (F2P) games. This game has always been F2P. I remember grinding it out on Bera ages ago. I think Scania befor that?