Warzone 2100 - RTS

Warzone 2100 is a real-time strategy game in a post-apocalyptic setting that was developed by Pumpkin Studios in 1999. It was one of the first real-time strategy games in 3D, and is now the first commercial RTS that was made available under the GPL in December 2004.

Features:

-400+ Technologies to research
-2,000+ different units to design
-3 Large campaign maps to conquer
-24 Fast play mission maps for extra action
-Intelligence Display sets objectives dynamically
-Interactive message system
-Fast Play Interface graphically Based
-Quick Screen Navigation
-Fast Find System for units & structures
-Set Factories to constant production
-Automatically send each factory's units to where you want them

-Play campaign games or fight in Death Match battles
-Fully customizable set-ups
-Select technology levels
-Set power levels
-Create and break alliances
-Design your own custom force
-Save out force rosters for future battles
-League table showing victories and losses

-2-8 Players
-Local Networks
-Mpath & Wireplay ready
-In Game Speech Transmissions between players.

Watch gameplay video:

Minimum system requirements:
-Win2000/XP/Vista/7/Mac OS X 10.4/Linux
-P166MHz
-32MB RAM
-8X CD-ROM
-2MB SVGA card
-75MB hard drive space
-DirectX compliant sound card

Download links:
Windows link.
MacOSX link.
Linux link.