First check out The Wolfenstein 3D Dome, The Diehard
Wolfers' Forum, and The Wolf3D Haven Forums.
Wolfenstein 3D demos,
abandoned/incomplete mods, authors' web pages, cheats, commentary, Easter
eggs, forums, guides, mirror downloads, news, previews, programming code
changes, reviews, saved games, screenshots, and videos:
Mods List With G
...19 Levels. Includes Rise of The Triad characters. It's a little bit different graphics engine that uses Castle Grom By Raziel as a base.