“WiFite is an automated wireless attack tool. It’s purpose is to attack multiple WEP and WPA encrypted networks at the same time. This tool is customizable to be automated with only a few arguments. It can be trusted to run without supervision. It was designed for use with pentesting distributions of Linux, such as Backtrack 5 R1, BlackBuntu, BackBox; any Linux distributions with wireless drivers patched for injection. The script appears to also operate with Ubuntu 11/10, Debian 6, and Fedora 16.”

Download in Terminal
wget -O wifite.py http://wifite.googlecode.com/svn/trunk/wifite.py
chmod +x wifite.py
python wifite.py