Freeware
Current version: 1.0.1
Requires MPW and the MPW IIgs
Assembler
MPW AsmIIgs Formats is an add-on for Apple's Macintosh Programmer's Workshop that adds support for syntax coloring when writing Apple IIgs 65816 assembly language. To use this, you need a copy of MPW (available free of charge from Apple) and a copy of the MPW IIgs Assembler (available for purchase through Syndicomm).