CrossPack - A Development Environment for Atmel’s AVR Microcontrollersfor AVR® Development CrossPack is a development environment for Atmel’s AVR® microcontrollers running on Apple’s Mac OS X, similar to AVR Studio on Windows. It consists of the GNU compiler suite, a C library for the AVR, the AVRDUDE uploader and several other useful tools. Features Does not depend on Xcode for building AVR code. Runs on Mac OS X 10.6 and higher. Supports 8 bit AVR microcontrollers
http://www.harbaum.org/till/macavr/
