This firmware is written for the ATXMEGA32A4U microcontroller. The hardware target is Openlights p/n 12009, an interface driver for LED strands that use a 2-wire serial control interface.
More information on the hardware is (or will be) available at http://openlights.org.
Portions of the firmware utilize the Atmel Software Framework. The binaries are built using Atmel's avr-gcc binaries on a Linux machine. It should be possible to build the code in Atmel Studio on Windows.