WifiZoo is a tool to passively gather wifi information. It works much along the lines of Ferret and Dsniff but is written in Python.
You can download it from the following link: https://packetstormsecurity.com/files/download/59749/wifizoo_v1.2.tgz
Source: https://packetstormsecurity.com/files/59749/wifizoo_v1.2.tgz.html