The SKAARHOJ Firmware updater includes the following open source components:

BOSSA Firmware uploader
Copyright (c) 2011-2012, ShumaTech All rights reserved.

avrdude
GNU GENERAL PUBLIC LICENSE, Version 2, June 1991

ORSSerialPort
Copyright (c) 2011-2012 Andrew R. Madsen (andrew@openreelsoftware.com)