Nixos. Or guix
Honorable mention
Plan9
Hint: :q!
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I considered BSD, but i don't think any of my hardware works well with it, plus i now also have the problem that i got hooked on declarative configuration with nix. I think i'll settle on still using linux, but trying more obscure distros. Atm i'm exploring the idea of daily driving GNU Guix (with a regular kernel and some proprietary software though).
Haha. But un-ironically, Rasbian OS (Debian build for Raspberry Pi); because open hardware is the next thing we desperately need more adoption of.
Haiku.
BSD.
Just live program your system from scratch every time you start your computer
My PC is an electro mechanical pinball table from 1971 (Williams Klondike, btw) running Puppy Linux.
Linux From Scratch
We're a bit of a way off but https://www.redox-os.org/news/ and https://asterinas.github.io/blog.html look interesting
BSD of course
ReactOS