Archon ---> Quake. You heard right, elements of the 80's micro game archon extrapolated into the Quake universe. Get ready for a wild ride. (free stuff | no warranty | see disclaimer.txt | blah blah blah.)
Alpha release = painkeep cube, morphic cube, crates, runes, regman quad-barrel dwarfcutter, quantum tunnel apparatus, super gravity well, chaos teleport sphere, power points, new maps, new and random monsters, frikbot, pkbot, pkplus support, more. Alpha code may fail - see disclaimer.txt, readme.txt, archon.txt.