OpenRC/Event Driven
From Gentoo Wiki
In the history if init system redesign, upstart made a bold claim[1] that it is revolutionary over the dependency based systems. We credit the event driven concept upstart has been proved as a init system. While in this page, we are going to show that OpenRC can get to know Dynamic Nature of Linux via external tools. Therefore the philosophical difference between OpenRC and upstart is that, combining small tools together versus integrate every wanted feature into one program.
example: hotplug iPhone for tethering
This example makes use of sys-fs/udev and app-pda/ipheth-pair. Details here
