KEGS is a emulator of the Apple IIgs computer, running on many different platforms, including the Amiga. KEGS emulates the 65816 processor, 5.25" and 3.5" disk-drives, Apple II sound and all Apple IIgs graphics modes. Keyboard, mouse and joystick are supported.
For KEGS you need Amiga OS 4.x and the ROM images from an Apple IIgs.