Warzone 2100 is an 100% free, cross-platform and open source 3D real-time strategy (RTS) game.
Being developed by Pumpkin Studios, the game has been published by Eidos Interactive, and its gameplay can be easily compared with the one from the Earth 2150 game.
Most major Linux kernel-based operating system have the Warzone 2100 game in their official software repositories.
Another interesting feature is that the Warzone 2100 game runs on all mainstream operating systems, including GNU/Linux, Microsoft Windows and Mac OS X.
It is also compatible with the FreeBSD operating system, and supports 32 and 64-bit computer platforms.