systemd - systemd is a replacement for the init daemon for Linux (either System V or BSD-style).
Prometheus - An open-source systems monitoring and alerting toolkit.
sysvinit - Savannah is a central point for development, distribution and maintenance of free software, both GNU and non-GNU.
runit - runit is a cross-platform Unix init scheme with service supervision, a replacement for sysvinit...
nosh - The nosh package is a suite of system-level utilities for initializing and running a BSD or Linux...
RackTables - Racktables is a nifty and robust solution for datacenter and server room asset management.