RedFang is a small proof-of-concept application to find non discoverable Bluetooth devices. This is done by brute forcing the last six (6) bytes of the Bluetooth address of the device and doing a read_remote_name().
This script creates five monitor mode interfaces, four are used as APs and the fifth is used for airodump-ng. To make things easier, rather than having five windows all this is done in a screen session which allows you to switch between screens to see what is going on. All sessions are labelled so you know which is which.
BlueRanger is a simple Bash script which uses Link Quality to locate Bluetooth device radios. It sends l2cap (Bluetooth) pings to create a connection between Bluetooth interfaces, since most devices allow pings without any authentication or authorization. The higher the link quality, the closer the device (in theory).