Recommendations These are the games that I've played and highly recommend to people. Keep in mind I haven't played everything (And not even close to it), so this list isn't the most accurate out there.
OpenArena - Standalone Mod for Quake III. Lots of players, and it works very nicely! -- FPS Phosphor - Great if you're looking for a quick fix. FPS Wolfenstein: Enemy Territory - It's really annoying to get working and find a good server. Try the NoobyLand server. FPS ArchLord - Great MMORPG. It used to be P2P, but has recently switched to F2P. MMORPG Dungeon Runners - Hilarious MMORPG. It mocks all other MMOs, and will make you laugh occasionally. MMORPG. Rakion - Really fun as long as you don't suck. PVP Game. Space Cowboy Online - Very different style MMO. The PVP is phenomenal. MMORPG. Mythos - The only way to describe this is to say "Diablo III". MMORPG
Tools Helpful chat and instant messaging tools to speed things up.