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.
All my servers are Debian, I don’t currently have a desktop installation right now, but if I did it would probably be Debian still. As far as DE, I was always partial to XFCE, but the newer Gnome has also grown on me a little.