This is a free FPS with high quality. It's primarily a game for online playing, but also has some tutorials you can play locally. Supposed to be nice! You can find reviews of AA and AA: Special Forces at GameRankings.com.
Download (750 MB)
This is the first game that ALTAR interactive made. I'll just quote the description:
Download (276 MB)
Two competing corporations have gone to war over a distant world. Your employer has placed you in command of a customizable army of ground and air forces - victory is your only objective.
Ground Control is a frenetically-paced, visually stunning real-time strategy game that combines a host of features to make it a truly unique gaming experience.
Download (458 MB) - Reviews