"Da Kills" Final Release (8-1-1995) is an old partial mod with single player, co-operative (required to finish), and deathmatch support. Brief description/story: You and your buddies were sent to an UAC WDS -- Union Aerospace Corporation Waste Disposal Site -- to search for any survivors and activate the automatic self-destruct in the center.
Compiled Da Kill's DKSPRITE.WAD PWAD file for DOOM 2 v1.9. It should work for newer DOOM 2 launchers assuming it uses v1.9.