inSSIDer Alternatives

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

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

Open Source

AirDroid Business, an enterprise-grade MDM solution, is designed to enable businesses mobility and productivity through remote access and control, device provisioning, policy application and management, kiosk mode, and geofencing.

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Wifi Analyzer is a handy tool which helps you to select a better channel for your wireless router.

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

Official source of information about Netstumbler.

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

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.

Open Source

Aircrack-ng is an 802.

Open Source

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

Lizard Systems WiFi Scanner is a multi purpose WiFi scanner and WiFi troubleshooting tool designed for dealing with all WiFi related issues conveniently.

The Free Wi-Fi Coverage Mapping Site Survey Tool

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