Warzone 2100, a commercial real-time strategy game developed by Pumpkin Studios and open-sourced (content and source code – making it a free game) by Eidos Interactive, has had a version 2.0.9 release from the Warzone 2100 Resurrection Project. This is a Linux-specific release to fix a compatibility issue with libvorbis 1.2.0.
If you want to learn how to play, there’s documentation online here.
Edit: devurandom pointed out in the comments that version 2.0.8 was released the day before with additional bugfixes. There’s also this note:
The MojoSetup installer is now based off the Debian 4.0 package and should thus run on a wider range of systems. Additionaly I included a GTK2 frontended, so you should no more need a console to install it.