iSlot 1.0 for Mac was available as a free download on our application library. This free software for Mac OS X is a product of jeremymeile. The software lies within Games, more precisely Tools.
From the developer:
iSlot is a "macros-cache.txt" storage tool for World of Warcraft. Let me explain it: WoW stores all macros from your account to the "macros-cache.txt" in your WTF/Account/accountname/ folder. Each account has 36 macro slots. If you relog or /reload your UI the current ingame macros are saved to the Blizzard servers and the macro-cache.txt on your computer.
Arena / PvP player in example often need more than 36 macro slots for one character.
You may want to check out more software for Mac, such as Labyrinthus X, iDistract or JourneyMaker, which might be similar to iSlot.