If you haven't played them the original Fallout 1 and 2 (the Fallout 2 Restoration Project is a big recommend) and Arcanum are classics as well.
Gaming
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I wholeheartedly second Fallout 1 & 2. Arcanum somehow avoided my notice back in the day, but I'm planning on playing it soon.
I highly recommend looking into Spiderweb Software games. They've been pumping out top down turn based tactics rpgs for years now. I am not sure of the viability on Linux, but I'm sure there is a workaround if anything.
The Avernum series in particular is great if you're into detailed character building, exploring, and high difficulty optional quests/bosses!
Caesar 3 is a fantastic city builder that will run on just about anything. https://store.steampowered.com/app/517790/Caesar_3/
Augustus is a great remake of the game engine to add some quality of life things to the game and make it run easier on more modern systems
Have you played the old LucasArts SCUMM adventure games? Full Throttle, Monkey Island, The Dig, and Grim Fandango are masterpieces.
Septerra Core. I used to go to a friend's house and we would take turns playing. It's been.. a long time, but I remember loving it.
Planescape: Torment is a classic from that era