"UT2004
"Unreal Tournament 2004 is closed source, but it's one of the few commercial games which also provide a native Linux port.
"I can say UT2004 has everything one would want from a shooter game: it has many types of weapons with secondary fire mode available, vehicles, several official modes of playing, like the Onslaught mode which is pure fun in my opinion, and combines both DM/TDM skills with vehicles, team synchronisation and, yes, brains. Because being late at a power node, even with two seconds, can cost your team the entire game or round. It's truly a game for teamplaying, and you'll never suceed in a 8vs8 Onslaught game all by yourself, no matter how good you are. You'll need to know how to wait in vehicles for your teamplayers, and when. You'll need to have each player with exact tasks, you'll need to know who your best manta/goliath/hellbender players are and let them use it at full potential. The Onslaught mode will be one of the best experiences of the game in my opinion."
