Builds of SheepShaver are available for Mac OS X, Windows and Linux. and PowerPC): version 10.3.9 or 10.4 and later download for Mac OS.
Using SheepShaver (along with the appropriate ROM image) it is possible to emulate a PowerPC Macintosh computer capable of running Mac OS 7.5.2 through 9.0.4. Download Pages for macOS 10.15 or later and. We support operating systems that not even Microsoft and Apple themselves support anymore, such as macOS X on PowerPC Macs, and RetroArch being available on Windows OSes as far back as Windows 95. In order to run such applications, macOS users must now install emulator software that runs old versions of the Mac OS in a window on the macOS desktop. SheepShaver is an open source PowerPC Apple Macintosh emulator.
PowerPC native applications are also not supported at this time. RetroArch can run on the usual platforms like Windows, Mac OS X and Linux, but it stands alone in that it can support far more platforms beyond just that. The PowerPC processor is not emulated at this time by current releases of SoftMac, so Mac OS 8.5, 8.6, 9.0 and X are not supported since those versions of Mac OS require the PowerPC processor.