Unvanquished Makes Its Open-Source Engine Easy For Other Games
For years the Unvanquished developers have been working hard on Daemon, which is their derivative of the ET:XReaL engine that in turn is an overhauled version of the ioquake3 and Wolenstein: Enemy Territory code. As they've done a good job at modernizing this game engine and making it fairly respectable for being a community, open-source project, they're making it easier for other projects to utilize Daemon.
Daemon has added features like Native Client support, its OpenGL 3 renderer is working well, SDL2 support, a C++11 code-base, and many other items differentiating it from the Quake 3 engine days.
There's been interest from Xonotic and Unreal Arena developers in using Daemon and could allow for better cooperation and sharing of assets between open-source projects. This initial work has landed in yesterday's release of Unvanquished Alpha 42.
The alpha 42 release of Unvanquished also has a new "Vega" map and there are various other bug fixes and engine improvements. More details on this monthly update to the Unvanquished game can be found via Unvanquished.net.