The latest release of MDK-ARM from Keil supports the Atmel SAM3N series.
It includes set-up files, device-specific views, and example projects. MDK features the industry-standard compiler from ARM, the Keil µVision4 IDE, the full featured RTX RTOS, and analysis tools. It is specifically optimized for single-chip, high performance devices such as the SAM3N series.
The Atmel SAM3N and SAM3S series provide capacitive touch support for buttons, sliders and wheels with the Atmel QTouch library and studio to deploy modern-user interfaces.