The Apple IIgs is to the Apple II as the Gameboy Advance is to the Gameboy. While the machine is backwards compatible, the GS has its own library of software that will not run on the Apple II.
If you add a category for the GS, I will start adding entries for it. However, I am not going to cram the GS software library in to the II library, as GS software is not compatible with the Apple II / Apple II+ / Apple IIe / Apple IIc.