Open-Source Warsow Game Development Appears To End
The Warsow video game was powered by the Qfusion engine, which they evolved into an advanced version of the open-source Quake II code. Thus it was a GPL game engine while their artwork ended up being under the Creative Commons. While it was one of the better open-source FPS video games and saw routine updates -- along with passing Steam Greenlight a few years back -- it looks like it's now game over.
This post by their former lead developer explains, "Just wanted to remind everyone once again that I'm no longer involved with Warsow nor have been for a while since I resigned six months ago or so. What was left of the development team has disintegrated and development infrastructure except for this website has been discontinued or abandoned. Please do not send me your feature requests or bug reports as I have no intention of getting back to Warsow or any other game project."
Thus with no development team left, it doesn't look like there will be any future updates. But at least anyone motivated can fork the code and continue on if they so desire. It's also a pity that Xonotic hasn't seen an official update in quite some time while it does continue to be developed. But at least there are other promising open-source video games like ET: Legacy, Battle for Wesnoth, 0 A.D., etc, but sadly no really promising open-source FPS video game built atop a more modern video game engine (ioDoom3 also remains rather stagnate and RBDOOM-3-BFG doesn't see too much frequent work; Unvanquished also hasn't seen a new release in a while but I hear there might be something soon...).