Cost / License
- Free
- Open Source
Platforms
- Linux
- BSD
systemd is described as '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' and is an app in the network & admin category. There are more than 10 alternatives to systemd for a variety of platforms, including Linux, BSD, FreeBSD, Mac and OpenWrt apps. The best systemd alternative is OpenRC, which is both free and Open Source. Other great apps like systemd are runit, Launchd, s6 and sysvinit.
a free system array created by Apple inc. For BSD - including macOS as macOS is based on the Darwin kernel of BSD
The Sysvinit package contains programs for controlling the startup, running, and shutdown of the system.
Supervisor is a client/server system that allows its users to monitor and control a number of processes on UNIX-like operating systems.



Chaperone is a lightweight alternative to process environment managers like systemd or upstart. Chaperone provides an extensive feature set, including dependency-based startup, syslog logging, zombie harvesting, and job scheduling.

There is a long list of technical arguments for why OpenRC is better than systemd. Popularity wise systemd seems to win these days. But as we've seen over centuries popularity served us wrong many times. Even Upstart was better, pretty bad it faded away.