Fedora Linux 44
Workstation edition, with the GNOME session still installed underneath. Two releases a year keeps packages current without rolling-release upkeep.
I compile, render video, and run local models on this. It's the only machine I work on.
Six choices decide how everything else on the machine behaves. The rest is configuration sitting on top of them, and all of it lives in my dotfiles↗.

Workstation edition, with the GNOME session still installed underneath. Two releases a year keeps packages current without rolling-release upkeep.
Scrolling tiling on Wayland. Windows sit on one endless horizontal strip you scroll along, so opening a new window never resizes the ones already there.
The bar, notifications, and system widgets in the screenshot above. It runs on Quickshell and is included from the niri config, so the two stay in sync.
Native and GPU-rendered, and it runs well before you configure anything. zsh underneath, starship for the prompt, tmux when a session outlives the window.
Opens large repositories without slowing down. Rust underneath, GPU-rendered, with multibuffers and a built-in agent for edits that span several files.
Screenshot annotation for Wayland. A niri bind runs region select and hands the result straight to it, which is how the shot above was captured.