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
FreeRTOS - Market leading RTOS (Real Time Operating System) for embedded systems with Internet of Things extensions
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OSX-AVR
Programming an AVR microcontroller using OS X
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