Fun and free old school realism FPS that runs on newer intel Macs (SL, Lion, ML) without Rosetta.
Supports both bots and various missions for most maps.
Download and install OpenArena:
http://openarena.ws/download.php
Download and install True Combat:
http://www.truecombatelite.com/index.php?page=downloads#q3tc
Make launcher using Automator:

Place OpenArena, True Combat folder, and True Combat launcher in the same folder (named Q3Mods in Automator example image) within the Applications folder.
Ready to play.
Hopefully someone remembers this game and would like to revive it within the Mac community like I do.
Supports both bots and various missions for most maps.
Download and install OpenArena:
http://openarena.ws/download.php
Download and install True Combat:
http://www.truecombatelite.com/index.php?page=downloads#q3tc
Make launcher using Automator:

Place OpenArena, True Combat folder, and True Combat launcher in the same folder (named Q3Mods in Automator example image) within the Applications folder.
Ready to play.
Hopefully someone remembers this game and would like to revive it within the Mac community like I do.