DarkPlaces is a glquake engine capable of playing on all quake servers (both NQ and QW protocols), as well as singleplayer, it runs all mission packs, and many mods and commercial games based on Quake.

DarkPlaces features a much more advanced graphics engine (including per pixel lighting and shadowing) which tries to make the most of the existing Quake content, an updated networking system supporting NAT routers/firewalls and smoother play, as well as many features for mod/game developers to use (as demonstrated by Nexuiz for example).

Build 20060725 of DarkPlaces engine and DarkPlaces mod have been released.
Note: darkplaces.exe has only stereo sound, darkplaces-sdl.exe has working surround sound (use snd_channels 4 to enable).

Happy QuakeExpo 2006 everyone!

Some screenshots of DarkPlaces mod with realtime world lighting and HDR bloom enabled: