An Apple IIgs emulator for Mac OSX, Windows, and Linux.
This is an early release of an experimental project to modernize the KEGS/GSport emulator platform and eventually extend it.
Go to https://apple2.gs/plus to get the latest downloads for your system.
You need to provide the ROM file and disk images and a config file. I'd recommend you just drop it in your current GSport or KEGS folder and run it from there.
See the doc/gsplusmanual.pdf file for much more complete documentation.
See the /doc/ directory for "Developer-Quickstart" docs which cover building for the various platforms.