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

runit is described as 'Cross-platform Unix init scheme with service supervision, a replacement for sysvinit, and other init schemes. It runs on GNU/Linux, *BSD, MacOSX, Solaris, and can easily be adapted to other Unix operating systems' and is an app in the os & utilities category. There are more than 10 alternatives to runit for a variety of platforms, including Linux, BSD, FreeBSD, Docker and DragonFly BSD apps. The best runit alternative is systemd, which is both free and Open Source. Other great apps like runit are OpenRC, Launchd, s6 and perp.
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.



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