Other than Doom and Doom-engined games, in no particular order, the games that are currently likely to be played by me are:
Thief 1&2
MoHAA
Duke Nulkem3D
Wolfenstein 3D
Unreal Tournament (UT99)
Blood
Eye of the Beholder 1 & 2 (and occasionally 3)
Quake & Quake 2
Red Faction
Blake Stone
No Man's Sky (but getting bored of that one)
Minecraft
Syndicate
System Shock 2
The Outer worlds
The Witcher 3
Cyberpunk 2077
Lots of others too, of course, but the ones above are games that I keep coming back to and have played right through several times. I realise that a couple of them are quite new, but I have played them a lot, and expect to continue to do so, so they count.

I also sometimes fire up Heavy Metal FAKK2 and Daikatana as guilty pleasures. I have completed Heavy Metal FAKK2 several times but I am still on my first play through of Daikatana. Every few months I fire it up, play it for a bit but it's a hard slog. I really have to be in the mood for it. Sometimes it's fun but often it isn't.