Macintosh Macintosh WWW page. Macintosh emulators at wilbur.stanford.edu. This is a commercial emulator including special hardware. Cracked versions of this emulator working without any additional hardware are known though. This is also a commercial emulator produced by Utilities Unlimited headed by Jim Drew.
Emulation uses special Emplant board which is promised to emulate other platforms as well.
You will need an image of the Macintosh ROMs stored in a file. ShapeShifter is a shareware Mac emulator for Amiga. It doesn't require any additional hardware and multitasks. ROMs image is required. Apple II Apple II WWW page.