I'm catering to a small audience here, but since there are several programs that use rom_tool for windows but none for OSX I figured I'd have a crack at it. This is written in Python, then converted with py2app, so you can launch it just like any other app. You don't need python installed since py2app takes care of things like that, but OSX comes with Python anyway. Since its in python it is by default open source. I can't be arsed to upload the py files but if you are looking for them you probably know how to get to it anyway. Share any bugs that pop up. I'll do what I can to fix them. Disclaimer: I'm not a coder. At all. I can work my way through it, but I guarantee absolutely nothing. If this app causes your mac to explode and kill your cat I will bear no responsibility. You have been warned.