An Apple ][e emulator for the Mac, under the GPL. Source is available
as emsrc.sit, hopefully in the same directory as this file. Also try:

   <ftp://ftp.asimov.com//pub/apple_II/incoming/emsrc.sit>
   <ftp://ftp.asimov.com//pub/apple_II/incoming/emsrc.txt>

It's not quite as spiffy or finished as STM, and it isn't very fast on my
660AV, but it does have an 80-column card. I don't know what disk format
it uses or whether it's enhanced; you'll have to check that out for
yourself. There's no sound on my machine, but that could just be typical
AV strangeness.

I don't know if this has a copy of the authentic ROMs or a semi-clean-room
reimplementation. I wouldn't be able to tell the difference. =)