Dale Rapp from daleswifisec writes:

Fern Wi-fi Cracker can crack WEP, WPA, and WPA2 secured wireless networks. Fern basically takes the command line utilities to crack these networks and puts them in a GUI. Very simple to use… scary easy! Fern also provides some extra functionality for hijacking sessions and locating a computers geolocation via its Mac address, but I have not tested with these features.  

Read more at: Cracking WPA using Fern WiFi Cracker