Witgui for Mac OS X
It's not complete with features (yet), but it helped me batch rename my files. There isn't much for mac apps here, so show the dev support and maybe more features will be implemented!
Witgui can be found here.Witgui is a graphical user interface for wit, a command-line tool for Wii games, available for Mac OS X. With Witgui you can manage your game collection with just a few clicks.