I think I'm just going to make the G3 chime patcher a native Mac OS X application and forget about Windows and Linux for a GUI for this project. I haven't used Cocoa and Objective-C in a while and I want to get myself back up to speed I'll still make a command line version that can be run on Windows/Linux.

I'll try to make it a universal binary for 10.4 and above. That way you can run it directly on the G3. It'll still require a classic Mac OS version installed to run the firmware update though.