DOOMHACK

DOOMHACK FILES:
"This mod DOES require ZDoom to play. Even though it uses DeHackEd it just doesn't seem to work in PRBoom+."

"Not too sure what's in it yet."
http://dl.dropboxusercontent.com/u/61176790/fatherofdoom.7z

This still has the modified Doom levels in it, but there's not enough to make it a full IWAD. It won't run standalone. I can find Doom 1 level modifications from 1994 on /idgames, so I figure this is cool."
http://puu.sh/aDNLk.wad

"This is pretty much the same as the first, but does not contain any maps or textures. It's pretty easy to make yourself from the first one if it's taking too long to download. This can be run on top of any megawad (or single-map wad even) that you want, provided it doesn't modify original monsters via DECORATE or something."
http://puu.sh/aDOGa.wad