Aircrack-ng - Aircrack-ng is an 802.
NetSpot - NetSpot is a free app for wireless site surveys, Wi-Fi analysis, and troubleshooting
Fern Wifi Cracker - Your description
Vistumbler - Vistumbler is a wireless network scanner for Windows Vista and Windows 7. Features:
WirelessKeyView - Recover lost WEP/WPA keys stored by Wireless service of Windows
Kismet - Kismet is an 802.11 layer2 wireless network detector, sniffer, and intrusion detection system.