The Ubertooth One is an open source Bluetooth test tool from Michael Ossmann. It is the world's first affordable Bluetooth monitoring and development platform and is a fully open source product (both hardware and software).
Getting Help: https://github.com/greatscottgadgets/ubertooth/issues
Hak5 Interview with creator Michael Ossmann: https://youtu.be/lAtvGksBOiw
Michael Osmann ShmooCon presentation: http://youtu.be/KSd_1FE6z4Y
Hak5 Microwave / Spectrum Analyzer demo: https://www.youtube.com/watch?v=cYDLxNatI54