I'd second pretty much everything skillsaw has made, he knows how to add pressure and keep things fun.
As for other recs, here's my tiny list:
TNT:Revilution
Any of the Doomer Boards Projects (yes ik, despite all the drama and controversy)
Going Down (haven't played this one yet, looks fun)
Good Morning Phobos (this one is stuck in WIP, despite it being mostly done at this point, just needs some touches)
3 heures d'agonie 3
Doom 64 for Doom 2
Rapidfire 1+2