[__d]

The other "Helios" project was a commercial operating system from Perihelion Software, which was subsequently kinda open sourced after the company went bust (which is the GitHub repo posted).

There are a couple of books about it from Prentice-Hall: ISBN 0-13-381237-5 and ISBN 0-13-386004-3, plus various academic papers, commercial software for the OS (mostly development tools), open source software (X11, gcc, other stuff), etc, etc.

It was the default operating system of the Atari Abaq/ATW (https://en.wikipedia.org/wiki/Atari_Transputer_Workstation), and also ran on various other Transputer, i860, and various other early parallel computer systems.

It too was a micro-kernel, with a very Plan9-like global name system implemented by applications plugging into the name server protocol.

If nothing else, it might be of interest to read up on it, but given the similarities between the projects, it seems to be an unfortunate naming collision.