The Ubertooth One is an open source Bluetooth test tool from Great Scott Gadegets. It is the world first affordable Bluetooth monitoring and development platform and is a fully open source product (both hardware and software).
Commercial Bluetooth monitoring equipment starts at about US$10,000. Project Ubertooth seeks to produce an affordable platform that can be used for Bluetooth monitoring and for the development of new Bluetooth and wireless technologies.
Low-cost off-the-shelf Wi-Fi adapters have supported monitor mode for years, and the technique has found diverse uses in security research, troubleshooting, product development, intrusion detection, and more. Unfortunately, there has never been an equivalent tool for Bluetooth before Ubertooth One, a fully open source platform (both hardware and software).
You will find out more information about Project Ubertooth One from Great Scott Gadgets website at: http://www.greatscottgadgets.com/ubertoothone/