So I've recently bought The Ultimate Doom on Steam ($5.00 USD when not on sale, if anyone was wondering), and I stumbled across a very interesting find: DoomZ, or DayZ rebuilt into GZDoom and Zandronium, two ports of the 20 year old engine.
I haven't been able to test it yet, since my personal computer is unable to be used, but I just thought I might share my find.
DoomZ Main Website
[youtube]fJLTgqbC3Lk[/youtube]