systemE is described as 'Using the tooling in this repo, I am able to boot from linux to sinit as PID1, and from there to Emacs acting as PID2 using --script mode, performing all typical rc.boot system initialization using Emacs lisp until we hit the getty' and is an app. There are more than 10 alternatives to systemE for a variety of platforms, including Linux, BSD, Mac, Self-Hosted and Python apps. The best systemE alternative is systemd, which is both free and Open Source. Other great apps like systemE are OpenRC, runit, Launchd and s6.
hummingbird is an init system designed for speed. It does nothing more than start the system and stop the system by default. There are three main "runlevels", fs which is called directly after the pseudo filesystems necessary for the system to run have been mounted...
