GNU Guix

WDYM the repos are very slow?

i’m using it as a daily driver for a couple of years now

it is built so that non-free packages can be made easily available (e.g. the non-guix channel). being sort of a meta-OS, already a bunch of operating systems were built on top of it, arguably easier to just get started as a novice

As a counterpoint to the majority of answers here, I’d love to suggest GNU Guix as the best answer. Like Nix, but enhanced for freedom with a formidable governance model. Built on freedom. Built to last forever. Also easier and more beautiful