FOS: Stands for "Free Operating System" as an inclusive term. Includes GNU/Linux, NonGNU/Linux, *BSD that are meant to liberate ones computing.
I'll start, I use Linux Mint on my laptop that I use for work daily. It uses the latest Xanmod linux kernel and flatpaks for apps with GNU Guix providing everything else.
debian stable on my servers, for my desktop im using Nobara Linux which is just plain Fedora but it comes with everything and the kitchen sink pre-installed and ready to go (i dont have time to fiddle with my PC all day to make stuff work). its maintained by the same guy who does the Proton-GE fork