I found a very aging website with a lone screenshot and an apparently still valid link to a 3D game / engine demonstration called "KABOOM." From the screenshot alone, it looks to be on par with Wolfenstein 3D. No further information then that. I could not find "KABOOM" anywhere on here so, if it is here somewhere, my apologies.
LINK
http://www.angelfire.com/id2/qbkaboom/