KMQuake2 is a source port for the Quake 2 game. Originally it has been started
to extend the engine limits for in-game map sizes, entities count, sounds,
drawing distance and so on. Later, improved particle system, clipped decals,
stencil shadows and lightning effects have been added, making this port one of
the most visually advanced ports produced for the Quake 2.

NOTE:
copy the quake2 gamedata files (pak0-3) to
~/.local/share/quake2/baseq2/

HIRES maps + other stuff
http://www.markshan.com/knightmare/downloads.htm