DarkPlaces Engine Stable Build 20140513 / Development Autobuild
This engine is a modification of Quake
It can not easily be described, as it is simply an improved version Quake, not a total conversion.
The realism of shell casings falling to the floor, much improved bullet impacts, 32bit color alpha blended explosions, blood flying everywhere and sticking to the walls...
Behind the scenes the code has changed a great deal, I was not content with the original QuakeC code, and I have greatly changed the engine while maintaining compatibility with normal quake modifications.