Rex’s Debian Bookworm is essentially the same as the “official” OS, but it’s not outdated, can be upgraded properly, and doesn’t have bugs/issues with battery charging and some other things, unlike the official OS. 
There are lots of others, of course, depending on the flavor of Linux you like. Most are linked in relatively active posts in this forum, so searching should find them. Besides Kali, I’ve seen Arch, PostmarketOS (which seems popular among those who got the 4G cellular and want to try to use it like a “phone”), Parrot (which I think was a version of some other flavor of Linux for pentesting?), Ubuntu (possibly several different builds, I forget), and probably a few others I’m not remembering. Chances are if there’s one you’re interested in, a search would turn it up here. And some people have posted a lot of detail about how they created their OS builds so that info could probably be used and adapted to get other, different versions of Linux working as well if you’re comfortable with that sort of thing, (I’m not, but I’m glad others are!)