Here's a port of ECWolf, which in my opinion is the most advanced Wolfenstein 3D engine source port available at the time of this writing. (http://maniacsvault.net/ecwolf)

You need the original data files from Wolfenstein 3D, Spear Of Destiny or Super Noah's Ark 3D to use this.

Put the .WL6 / .WL1 / .N3D / .SOD / .SD? files from the original installation into (appdata)/ecwolf and start the application.

Some documentation is available in the pnd.

Discussion thread here: http://boards.openpandora.org/topic/16344-ecwolf/

History
==========
Build 02:
updated to latest revision (1.3)
Major features include an automap and support for Super Noah's Ark 3D
Further details at http://maniacsvault.net/entry70

Build 01:
Initial release.