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There is an arm version of pretty much every major Linux distribution now. I’ve used mint, debian, and kali all on arm.

Also, see below

My mistake. Guess what I meant is UNIX and UNIX-like.

Nothing personal against Linux, but I'd like to see something new, like TempleOS, for example.

There is quite a selection in the link I posted… for example FreeBSD/ARM

FreeBSD is a direct descendant of BSD which is UNIX. The BSDs are about as close as you can get to UNIX today.