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On Unix-like systems, OpenRC is a dependency-based init system that works with the system-provided init program, normally /sbin/init; however, it is not a replacement for /sbin/init.
OpenRC is 100% compatible with Gentoo init scripts, which means one can probably find one for the daemons you want to start in the Gentoo Portage Tree. OpenRC, however, is not exclusively used by Gentoo Linux and can be used on different Linux and BSD systems. Its creator is a NetBSD developer, who started the Gentoo/FreeBSD project.