What are some FOSS programs that you think are a far better user experience than their counterparts? - sh.itjust.works

I used Plex for my home media for almost a year, then it stopped playing nice for reasons I gave up on diagnosing. While looking at alternatives, I found Jellyfin which is much smaller and more responsive, IMO, and the UI is much nicer as well. It gets relegated to playing Fraggles Rock and Bluey on repeat for my kiddo these days, but I am absolutely in love with the software. What are some other FOSS gems that are a better experience UX/UI-wise than their proprietary counterparts?