To anyone who wants to get the beautiful lovechild of Doom and Wolfenstein 3D, there's these great WolfenDoom episodes by Laz Rojas. There's a TON of episodes and levels, so it should keep even an ardent Wolf3D/Doom fan busy for a while. Play with a source port like Zdoom or MBF. Enjoy!

http://lazrojas.com/wolfendoom/

(or alternatively : http://www.moddb.com/mods/wolfendoom/addons/laz-rojas-wolfendoom-packs-for-zdoom)

Also, a modder on the zdoom forums has made all of Laz Rojas' Wolfendoom map packs such as Astrostrein compatible with zdoom.

http://forum.zdoom.org/viewtopic.php?f=19&t=48518

Lets give this modder and Laz Rojas an applause for all the work they have put in these projects.

Edit; d'oh! Forgot the link, sorry people

A near flawless port of Wolfenstein 3D to ZDoom if you are looking more for a total and accurate conversion. Includes every official Wolfenstein 3D release including the so called 'Lost Missions'.

http://www.afadoomer.com/wolf3d/default.php

Also, Brutal Wolfenstein. I know some people aren't into Brutal Doom... I'm one of them but it works surprisingly well with Wolfenstein 3D.
http://forum.zdoom.org/viewtopic.php?f=19&t=48035