NetSpot - NetSpot is a free app for wireless site surveys, Wi-Fi analysis, and troubleshooting
inSSIDer - inSSIDer Essential makes it easy to maintain small business WiFi.
NetStumbler - Official source of information about Netstumbler.
Kismet - Kismet is an 802.11 layer2 wireless network detector, sniffer, and intrusion detection system.
WiFi Explorer - WiFi Explorer is a tool to scan, find, and troubleshoot wireless networks.
Actiontec Managed Wifi - Actiontec Managed Wifi is a best-in-class wifi optimization utility that provides expediency to broadband operators with all tools that are required to manage the home wireless networks.