SheepShaver

SheepShaver is a free and open-source PowerPC Apple Macintosh emulator that was created for BeOS and Linux. The name is a play on ShapeShifter, an AmigaOS Macintosh II emulator, which is not to be confused with the same-named third-party preference window for Mac OS X. Christian Bauer was the creator and programmer of the ShapeShifter and SheepShaver projects.