The AVR32 AT32UC3L software framework consists of AVR32 UC3L microcontroller drivers, software services, and demonstration applications. Each software module is provided with full source code, example of usage, rich html documentation and ready-to-use projects for the IAR EWAVR32 and GNU GCC compilers.
The software can be found on the AVR32 Technical Library CD, or downloaded from Atmel´s website at http://www.atmel.com/products/AVR32/ under the
"Tools & Software" menu.

Unzip the package zip file (AVR32-SoftwareFramework-AT32UC3*-x.y.z.zip) under a local folder on your PC.
Open the x.y.z-AT32UC3*AVR32_Readme.html file to browse through the documentation.

Brief

AVR32 UC3L Software Framework
AVR32 UC3L Software Framework