immortal
A *nix cross-platform (OS agnostic) supervisor
... service/worker/daemon, etc you may not want to spend to much time understanding how to properly launch something in the operating system your company is using. Probably you just join a new team and when are about to deploy, found out that the production servers are not using the OS you were used to besides they don’t support/have your known supervisor, have a mix of init/upstart scripts.