Oh wow, yeah. I've only just scratched the surface of it by End Of Starchild feels like it might be one of the coolest things ever made with the Doom engine? Fully freeware and standalone.
msx.horse/eos/
All these screenshots are from the same game
It's seemingly a followup to 2021's Time Tripper
New Map Labs - Mega Mania, themed around megastructures, is available. My map in it is "The Deep Afar". Special, huge thanks to @makkon.bsky.social and @a-shift.bsky.social for the textures, couldn't have done it without them. www.moddb.com/mods/map-lab...