SheepShaver is an open-source PowerPC Apple Macintosh emulator originally designed for BeOS and Linux.

The ShapeShifter and SheepShaver projects were originally conceived and programmed by Christian Bauer.

SheepShaver was originally commercial software when first released in 1998, but after the demise of Be Inc., the maker of BeOS, it became open source in 2002.

Although SheepShaver does have Ethernet support and CD-quality sound output,[1] it does not emulate the memory management unit.

[2] While adding MMU emulation has been discussed, the feature has not been added because of the effort required in implementing it, the impact on performance it will have and the lack of time on the part of the developers.