NewWolf features OpenGL rendering, but does not have any sound support because the port uses a proprietary (ie: no source code) sound engine. To run NewWolf use the included batch file as there is an issue with 16bit color depth (the batch file will force 32bit).
more info -> http://newwolf.sourceforge.net/
EcWolf is straight up software rendered using SDL with full sound support and is very true to the original. Simply run ecwolf.exe.
more info -> http://maniacsvault.net/ecwolf/
I have also included the original Wolf3D 'demo' game files so people should be able to play this straight away. If anyone has concerns about this, let me know and I'll remove the game data.
These are also on the SVN repo, so feel free to pull it from there if you like.