Aircrack-ng - Aircrack-ng is an 802.
Vistumbler - Vistumbler is a wireless network scanner for Windows Vista and Windows 7. Features:
Kismet - Kismet is an 802.11 layer2 wireless network detector, sniffer, and intrusion detection system.
inSSIDer - inSSIDer Essential makes it easy to maintain small business WiFi.
Fern Wifi Cracker - Your description
NetSpot - NetSpot is a free app for wireless site surveys, Wi-Fi analysis, and troubleshooting