I have ported the Wolfenstein missions to DOOM II, creating what is essentially an improved and updated Wolfenstein. Each scenario is painstakingly recreated as a DOOM II WAD, complete with all the Wolfenstein textures, objects, sounds, and enemies. The result is a total conversion.
You will need EDGE 1.35 or later (edge.sourceforge.net) and a Doom 2 IWAD. The most noticable difference between this and the ZDoom version is the 128x128 walls and sprites, new HUD display and treasure items that actually have a function (somewhat). There are other less noticeable differences and improvements as well, by CeeJay