I expected this to work like Joy2Key or XPadder on Windows -- but ChoiceStick is specifically made for 9-pin joysticks, such as Atari, Sega Master System and Genesis. How you connect them to a Mac, I don't know. (my G3 iMac only has USB ports -- maybe earlier Macs had the DB9 ports?).

It's possible ChoiceStick was sold with a dual DB9 to USB adapter. The program is useless without that piece of hardware, but someone out there might have the adapter and find this useful.

My question is, is there a utility like Joy2Key or XPadder for Mac OS 9?

I'm using a physical G3 iMac, not an emulator.