GuestPC

GuestPC is an emulator designed to run IBM PC-compatible x86 systems on macOS. Developed by Lismore Systems, it was aimed at users who wanted to run old software or systems under a Windows or DOS environment on their Mac.

While originally designed for older versions of macOS, its exact functionality on recent architectures (Apple Silicon or modern macOS) is undocumented. Its approach was to provide a paid alternative to solutions like Virtual PC, with compatibility targeted at the hardware configurations of the time. No recent updates or active support are confirmed.