Nazis, nazis, and more nazis. This mod replaces ALL Doom 2 enemies with SS, Afrika Korps, and other Wolfenstein-inspired (but not directly recreated) enemies, as well as new World War 2-era weaponry. I recommend playing with Epic2.
Woolie Wool, DavidPH, among others - see ww-nazis-lore.txt for full list
ww-ana.wad, DDD.wad by Woolie Wool
SLADE 3.0.2, Paint Shop Pro 9, GoldWave, ChaosEdit, Notepad++