I spent some time recently playing with an old PowerBook 150, my daily routine involves working on Unix-like systems. I remembered that Prentice Hall had worked on a 68k MINIX 1.5 port in the 90's, sadly only the Amiga really saw continued community/developer interest and there was no public 1.6 or 2.0 port.
It is perhaps a novelty, but, many Apple models lack sufficient RAM to boot or run NetBSD or Linux, so this is an interesting hobby project to attempt to revive, perhaps for learning the Motorola 68k ISA or to explore the classic MacOS environment. The MacMinix kernel cooperates in such a way that allows for examining the system with a conventional set of Unix utilities.
The greatest challenge was obtaining the source code, this is part of the MacMinix and was contained inside a Minix filesystem image. So, I put on my digital archaeologist cap and attempted to recover it.
So, here is the complete source code for MacMinix 188.8.131.52 on GitHub! Also included is some associated documentation and patches previously contributed by volunteers over the years, originally hosted by Brad Pliner.