This software includes the firmware for a usb-to-IR sender dongle, the host cli interface for windows and linux and a labview programm for sending IR commands.
This package makes use of v-usb for avr, which can be used in the terms of GPL v2.
IRMP is a package by Frank M. from the http://www.mikrocontroller.net/ web-board. The header also states a GPL license, a svn repository is over at mikrocontroller.net.