Hacker News Reader

See also Darling, which is newer and still active. http://www.darlinghq.org/

Yes, but it will not have PPC or Rosetta support. It is only able to provide facilities to run Universal or x86 mach-o binaries.

QEMU [1] has had full emulation support for about a year now (three if you count it in a broken state).

[1] http://wiki.qemu.org/Documentation/Platforms/PowerPC

Note that if you just want to run recent versions of OSX there are better options out there. See for example

https://github.com/AndrewDryga/vagrant-box-osx

See also PearPC [1]. The project stems from the time where Macs were still based on PowerPC (PPC).

[1] https://en.wikipedia.org/wiki/PearPC

I've never really been particularly interested in a OSX emulator for Linux --- but a MacOS emulator would be really cool (not a machine emulator, but a 'syscall translator', and yeah, I know that MacOS didn't really have system calls).

Does anyone know of one?

It is an old project which if I recall stopped moving forward a couple years after Apple switched to Intel processor. The sourceforge page show latest news is from 2007.

I didn't use an apple OS until OS X. So, I can't really think a reason why this would be useful. Can somebody throw some light?

Mac on Linux (2007)