S6 is a small suite of programs for UNIX, designed to allow process supervision (a.k.a service supervision), in the line of daemontools and runit, as well as various operations on processes and daemons.
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Pros
Pro The perfect init
s6-rc, provides a real Service Manager, a Services Supervisor with Parallel RC and logging, upon demand. The perfect continuation, of Runit.
ISC License, is not a barrier, Ibut instead, is so friendly to Open Source and Free Software Licence.
Pro Rock solid
Portable: Linux, BSD, Solaris
POSIX.
Can be compiled with musl.
A lot of features including dependencies service management.
Easy to implement with the conjunction of 66 which provide frontend file for service declaration, automatic logger creation,nested supervision tree,user service,instantiated services and many more.
Best alternative ever. Work out of the box, PROC was made on Gentoo, Funtoo, Devuan, KISS linux, Adelie, Void, Antix.
Default init system and service manager on Obarun and from a long time ago.
Pro You can use all its components independently
Pro Runs on every POSIX system
Pro Fastest init
Fastest boot speed.
Pro ISC License
Cons
Con Heavy
It depends on libc, has a lot of code.
Con Not GPL
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