Unreal Tournament 2004 (demo)
Great FPS game. Lots of vehicles. Lots of great game types, including power nodes (like starwars battle front).
Get it here
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Marathon (Marathon, Durandal, and Infinity)
The FPS Bungie made before Halo. Great game with a huge campain and lots of multiplayer maps.
Get it here
Note: You must download the aleph one environment for the OS you want along with the game(s) you want for marathon to be able to run in OS X. It's in the link.
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Commander Keen (Marooned on Mars, Secret of the Oracle, Aliens Ate My Baby Sitter [demo], and The Lost Episode [demo])
This was originally a DOS game, but I always think of it as a mac game because back when it was new, we had softwindows on our performa and I'd play this for hours. The game is similar to mario, except with a cooler story and a gun. This triggered my addiction to pizza and pepsi, both of which you must collect in the game for points. I highly recomend this.
Get it here
Note: you must first download DosBox (an emulator) to run this game.
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More games will be added soon. No time to do them now, but there are many more great ones.
