SheepShaver

SheepShaver is an open source which virtualizes a PowerPC-based Macintosh computer. It runs natively on systems with a PowerPC processor, and can emulate a PowerPC processor on systems without one. The software is and can be used on a variety of operating systems. It has become useful for Mac OS X and macOS users as the ability to run PowerPC software was phased out with the adoption of Intel processors, and the discontinuation of Rosetta since Mac OS X 10.7 (Lion).

History
SheepShaver was originally released as commercial software for BeOS in 1998. However, with the closure of Be Inc., it was released to the open source community in 2002. The name is derived from "ShapeShifter", an earlier Mac emulator for.

Ports of SheepShaver exist for multiple s, including BeOS, Linux, Mac OS X, and Windows NT. A for Apple Silicon, such as the Apple M1, is in development.

Released under the terms of the, SheepShaver is freeware, and its source code is available on along with that of Basilisk II, a 68k Mac emulator.