Its retro and really rough around the edges (and QTE heavy) and is more of a life sim than a traditional adventure game, but Shenmue I & II introduced day/night cycles with NPC schedules, has a fun martial arts combat system, and the story is kind of like an 80s martial arts film with a detective kick. There’s also gambling, drinking, a little bit of working at the docks, darts, retro arcade games, and some sleuthing to progress the story. Your progress from Shenmue I carries over to II

But again its rough around the edges and sometimes referred to as QTE simulator (or Dock Worker Simulator, as I jokingly call it). But somehow, all these elements blend together well to create a unique game. Not going to be for everyone but I really enjoyed it

Final note: I highly recommend using a controller. I ran into issues with KB+M, especially after remapping keys. It broke some of the QTEs.

The OSRS client RuneLite is Linux native, open source, and Jagex (the developer) approved

Not sure how good it is but Ryzom is Linux native and open source. I’ll be checking it out soon