Wifi Analyzer Alternatives

NetSpot is a free app for wireless site surveys, Wi-Fi analysis, and troubleshooting

inSSIDer Essential makes it easy to maintain small business WiFi.

WiFi Explorer is a tool to scan, find, and troubleshoot wireless networks.

Vistumbler is a wireless network scanner for Windows Vista and Windows 7. Features:

Acrylic WiFi is a free to use WiFi scanning and channel scanning tool for the Windows operating devices only.

Scans wireless networks in your area and displays extensive information, including: SSID, MAC Address, PHY Type (802.11g or 802.11n), RSSI, Signal Quality, Frequency, Channel Number, and more...

Official source of information about Netstumbler.

Kismet is an 802.11 layer2 wireless network detector, sniffer, and intrusion detection system.

WiFi Radar Pro is a multifunctional WiFi management and monitoring highly optimized for the Mac devices only.

A 802.11 wireless scanner and connection manager for Mac OS X.

With Homedale you can search for Wi-Fi / WLAN Access Points and monitor their signal strength.

Wireshark is a network protocol analyzer for Unix and Windows. It lets you capture and interactively browse the traffic running on a computer network.

NetSurveyor is an all one network diagnosing and troubleshooting tool for the Windows operating systems.