The GOG Community Wishlist is a decent place to get ideas for this. Some of it’s just people wanting DRM-free versions of their favorite games but a lot of it’s abandonware. There’s also MyAbandonware.com.
Lots of lists of console exclusive games don’t seem up to date. This one by GamesRadar for example lists Returnal which is on Steam.
I would say the original Sims and the Sims 2. The complete collection versions of both. I would hope they would be bundled with fixes to work on modern operating systems.