Warsow 0.5 was released in August of 2009 but this Qfusion-powered first person shooter (and Phoronix Test Suite benchmark) is now being succeeded by Warsow 0.6.
Warsow 0.6 delivers on a number of new game maps, improvements to existing maps for improved visuals and other restyling, brand new weapon models for a more unified and modern appearance, a new game type, and new music. The new game type is Capture The Flag - Tactics.
Besides in-game improvements, Warsow 0.6 has an updated engine that delivers on more realistic lighting along with other improvements along with lower-latency network code and higher frame-rates due to engine performance optimizations.
The release announcement and download links can be found at Warsow.net.