I figured I'd post this, since nobody else seems to have mentioned it.
I guess this topic fits in this section since it's using the DarkPlaces engine.
D3W (ex)regular Kristus (and associates) bring more Quake-style arena-DM action to the world:-
https://www.doombringer.eu/
https://www.indiedb.com/games/doombringer
https://youtu.be/nQVy3JppXPk
I personally think this is very worthy of checking out for the old Q3A fans among us.
Cool, Steam just said it wasn't released when I check my wishlist, never said there was a demo.
I made the obligatory steam forum post saying it should be on gog too. :D