Armagerton Advanced is a free and open-source multiplayer 3D clone of lightcycle sequence in Tron. The game is just like the arcade-classic but in 3D, with unique graphics, HUD and customizable gaming arena. Armagetron Advanced can also be played in single player mode against AI computer bots.
Mac OS X 10.4 or newer
Intel or PowerPC powered Mac
Free download at armagetronad.org