If Dinit has been mentioned before on this list I did not find it.

I came across Dinit when I was looking at the distro Chimera Linux (what
is in a name) and apparently it is a installable option in Artix Linux.
And I like their introduction:

/Dinit/is a service supervisor with dependency support which can also
act as the system "init" program. It was created with the intention of
providing a portable init system with dependency management, that was
functionally superior to many extant inits. Development goals include
clean design, robustness, portability, usability, and avoiding feature
bloat (whilst still handling common - and some less-common - use cases).
Dinit is designed to/integrate with/rather than subsume or replace other
system software.|

We have been discussing init systems before and I think dinit with it
service description files, its dependencies management and supervisor
functions is a good contender next to s6.

You can find Dinit at Github https://github.com/davmac314/dinit

Grtz

Nick