DraQ
Arcane
Haven't played much of those yet, actually. Only Dooms and Heretic.Yeah, I've read about it. But Hexen and Strife do not have custom monsters, so the mode kind of loses it's purpose.Also supports Hexen, both Dooms and Strife (with custom dialogue included).
When run with Doom 2 it also includes modified version of Hell on Earth Starter Pack.
It actually got me to appreciate Heretic's ambush design, even though I still think it looks like half-assed Doom TC (not enough fantasy in the level design and lighting - it took Hexen to fix that).