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/59404/wifizoo_v1.1.tgz
Source: https://packetstormsecurity.com/files/59404/wifizoo_v1.1.tgz.html