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/62855/wifizoo_v1.3.tgz
Source: https://packetstormsecurity.com/files/62855/wifizoo_v1.3.tgz.html