Daemontools is a project mainly written in C and SHELL, it's free.
daemontools is a collection of tools for managing UNIX services.
daemontools was copyrighted by djb in 2001, and released public domain:
2007.12.28: I hereby place the daemontools package (in particular, daemontools-0.76.tar.gz, with MD5 checksum 1871af2453d6e464034968a0fbcb2bfc) into the public domain. The package is no longer copyrighted.
To install: clone this repo ./package/install from inside this directory