Liberty is a Palm OS program created by Gambit Studios that allows you to play Game Boy games on your Palm. Carpe Stellarem has ported the drag-and-drop ROM converter to Mac OS X.
The Mac OS X version includes the Palm OS Program, the Mac OS X version of the Liberty ROM converter, a trial license, and documentation. Carpe Stellarem will not help you find ROMs, don't ask.
We are currently working on porting the ROM manager from Windows. There is no expected release date yet.