KEGS is an Apple IIgs emulator for AmigaOS, Mac OS X, Linux, and Win32.
The Apple IIgs was the most powerful computer in the Apple II line.
It first was sold in 1986.  An Apple IIgs has the capability to run almost
all Apple II, Apple IIe, and Apple IIc programs.

KEGS uses SDL (Simple DirectMedia Layer) and emulates all Apple //gs
sounds accurately.  It supports limited serial port emulation through
sockets.  Audio emulation for Amiga is imperfect yet.