Tools

NetStumbler - The tool allows you to scan for nearby Wi-Fi access points and to get details about them.
ttp://www.netstumbler.com/downloads/

Hacking Wi-Fi Using Aircrack - http://www.tamos.com/download/main/ca.php

Cain and Abel.

AirJack -  downloadable as source code you then must compile. For some, this is going to be a bit more effort than they may 
wish to expend. However, AirJack is such a popular tool, I would be remiss not to cover it. You can download it from here: 
https://sourceforge.net/projects/airjack

Kismet is another tool that downloads as source code you must compile yourself. It can be downloaded from 
https://www.kismetwireless.net/. 

Both of these tools provide similar functionality to the tools we have already discussed. I am simply listing them here as 
alternative tools you may wish to investigate.