systemd is a suite of basic building blocks for a Linux system. It provides a system and service manager that runs as PID 1 and starts the rest of the system.
Cost / License
- Free
- Open Source (GPL-2.0)
Platforms
- Linux

Hummingbird Init is described as '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' and is an app. There are more than 10 alternatives to Hummingbird Init for a variety of platforms, including Linux, BSD, Mac, FreeBSD and OpenWrt apps. The best Hummingbird Init alternative is systemd, which is both free and Open Source. Other great apps like Hummingbird Init are OpenRC, runit, Launchd and s6.
systemd is a suite of basic building blocks for a Linux system. It provides a system and service manager that runs as PID 1 and starts the rest of the system.

a free system array created by Apple inc. For BSD - including macOS as macOS is based on the Darwin kernel of BSD
Supervisor is a client/server system that allows its users to monitor and control a number of processes on UNIX-like operating systems.



The Sysvinit package contains programs for controlling the startup, running, and shutdown of the system.