For me, it was perhaps simple-scan, a very simple and efficient GUI to scan documents. I used it with my Brother printer / scanner and it works like a charm. Especially since I do not scan stuff often, so a program with more complex UI would have the effect that I forget how to use it until the next time.
about 10 years ago, i noticed steam was available for linux. for the longest time i had pretty much written off gaming on linux (apart from like tuxcart, nethack, emulators…). i hadn’t considered actually being able to play “real” games.
that was before proton, so there really wasn’t a ton of stuff i could play, but i found some good stuff like hotline miami, papers please, super win the game.
obviously now we have proton and linux can be argued as a superior gaming platform in many cases.