Warzone 2100: you command the forces of The Project in a battle to rebuild the world after mankind has almost been destroyed by nuclear missiles.
The game offers campaign, multi-player, and single-player skirmish modes. An extensive tech tree with over 400 different technologies, combined with the unit design system, allows for a wide variety of possible units and tactics.
Version 3.1 Beta 4:
* New shortcuts to select units and lots of bug fixes.
This is a great game. You'll be hard pressed to find a better RTS game for the mac. Best of all this game is 100% free.
Hans(12/24/2008 - version 2.0.8)
Current version is 2.1 Final but this still has quite a number of bugs that make it crash. Developers promise to squash at least some (unknown which) by v 2.2
JP(12/8/2007 - version 2.0.8)
Hats off to the developers for porting this to the mac. It is a decent game with a lot of interface flaws. Pretty cool concept though. Worth checking out.