Finit is a simple alternative to SysV init and systemd, reverse engineered from the EeePC fastinit ten years ago by Claudio Matsuoka - "gaps filled with frog DNA ..."

Finit supports runlevels, process monitoring, and starting services on demand using the built-in inetd, or by triggering a condition. E.g., "don't start this service until basic networking is available", or "wait until syslogd has started".