Perhaps you’ve considered dabbling in AVR programming on OS X, maybe even sharpen up on Unix syntax in the process. Unfortunately, installing the Mac/AVR toolchain can be a very frustrating experience to the uninitiated. The process involves locating and installing countless interdependent apps, tools, and libraries. But just before giving in and trying another OS – help arrives! Check out AVR MacPack. This software package installs via the standard Mac method, just a few clicks and you’ve got all the necessary components for compiling and programming. –Link
AVR MacPack overview:
All for the low low price of – free.
Programming AVR MCUs on a Mac –Link