StarShip Troopers : Last Defense is a free 3D RTS game using the Glest engine, it is set in the StarShip Troopers Universe.
This is a full zipped version of SST:LD 2.1 (without multiplayer) for the mac. This does not work for PowerPC. You do not need any other files for this to work apart from the framework file which can be found in the description ->
You will need to install this framework - Downloads.xiph.org
This does not work on PowerPC Macs and you need no other files apart from the above to play.