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.)
Viddy from bot tests on pkn7 - UltraViolence
In this demo - 3 auto-sentries with different fire systems = nails, lightning and lasers. They really clean up.
Well, when I say "clean up" it really means splatter blood all over. :-)