|New level, "701", by Guy Matthew Babin aka Deadmeat, author of "Got Milk?" and "Skyscraper" from back in the Q2 heyday. The build quality is poor, but it's fun to play, and makes use of the traditional SHTF classic Quake end-of-level scenario.
Playthrough on youtube using a modernized engine:
Also, Sonic Mayhem by Quakeulf got a second update a few months ago with a new level and some additional changes. If you haven't played this unit at all yet, do so: you're in for a serious treat.