Another poster mentioned this. Here’s Finix: https://github.com/finix-community/finix

And here’s Sixos: https://codeberg.org/amjoseph/sixos

They both replace systemd. Both very interesting projects. Finix is reportedly daily-drivable but I’d steer clear of SixOS for anything but learning about alternative init systems. The talk linked from the repo is mind-altering; This SixOS guy is utterly brilliant.