Again, more information will be filled in here as it becomes available.
[coming]
Recently, Apple has endorsed a port of Linux to the PowerPC Macs. Check it out at: http://www.mklinux.apple.com/
In addition, there is an ongoing MacLinux/68k effort. It seems to be coming along rather slowly, though. For more information, see:
There is no current compatibility with MacMiNT.
I believe MacMiNT can be found on ftp://atari.archive.umich.edu
Unfortunately, MacMach died out years ago. However, the PowerMac Linux project is built on a version of the Mach microkernel. Check out OSF's Linux on the OSF Microkernel page.
You can mount A/UX filesystems read-only. There may be binary compatibility with A/UX binaries in the future (don't hold your breath, though).
You can use Lawrence Kesteloot's hfs tool to access MacOS filesystems as read-only. Use this tool to browse the filesystem and copy files to a NetBSD/mac68k partition. Someday we hope to run MacOS as a process on top of NetBSD/mac68k.
In addition to hfs there are the hfsutils collection of utilities for accessing the Mac HFS from within MacBSD.
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