Brutal Wolfenstein 3D is a Doom II mod that recreates Wolfenstein 3D and Spear of Destiny, with the awesome Brutal Doom style of gameplay.
WolfenDoom is a mod that brings Wolfenstein 3D into Doom and, as a result, the gameplay that is carried over benefits from the features of the newer engine.
The Classic Doom games are some of the greatest first-person shooters ever made.