AirRadar!

Let's face it-- there's SOOO much Wi-Fi everywhere these days, the built-in Wi-Fi tools and free utilities that used to help us understand the Wi-Fi environment just can't keep up anymore. Those tools don't help you see how many access points are in the same network, nor how many SSIDs a specific radio is broadcasting.

NetSpot is a simple and accessible wireless survey tool, which allows collecting, visualizing and analyzing Wi-Fi data.

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

WiFi Explorer is a tool to scan, find, and troubleshoot wireless networks. It can be used to quickly identify channel conflicts, overlapping and other factors (e.g. configuration issues) that may be affecting the connectivity and/or performance of your wireless network in homes, offices and other sites. It can also be used to find open, ad-hoc and even rogue access points. Additionally, it detects 802.11a/b/g/n/ac wireless networks and supports 2.4 and 5 GHz channel bands, as well as 20, 40, 80 and 160 MHz channels. It can also monitor signal strength of each network over time and export metrics (average, maximum signal strength, etc.) and network details to CSV file format. »

Kismet is an 802.11 layer2 wireless network detector, sniffer, and intrusion detection system. Kismet will work with any wireless card which supports raw monitoring (rfmon) mode, and (with appropriate hardware) can sniff 802.11b, 802.11a, 802.11g, and 802.11n traffic. Kismet also supports plugins which allow sniffing other media such as DECT.

iStumbler is the leading wireless discovery tool for Mac OS X, providing plugins for finding AirPort networks, Bluetooth devices and Bonjour services with your Mac.

With Homedale you can search for Wi-Fi / WLAN Access Points and monitor their signal strength. Use the detected access points with Google Geolocation and Mozilla Location Service to locate yourself.

KisMAC is an open-source and free stumbler/scanner application for Mac OS X. It has an advantage over MacStumbler/iStumbler/NetStumbler in that it uses monitor mode and passive scanning.

Connect to WiFi passwords for FREE internet access all over the world!

How strong is your WiFi signal?

A 802.11 wireless scanner and connection manager for Mac OS X. WiFi Scanner will detect access points and clients in ad-hoc mode if the SSID is being broadcasted. It can be used for wireless site surveys, wireless discovery, and to connect to WiFi networks. The tool reports signal strength in dBm and shows access point BSSID/MAC addresses. Features

Win Hotspot is portable WiFi hotspot application has inbuilt WiFi Scanner to list Channel ,Signal % etc. It Also has bandwidth meter and WiFi Repair Tools.

The Xirrus Wi-Fi Inspector is a powerful tool for managing and troubleshooting the Wi-Fi on a Windows XP SP2 or later, Vista, or 7 laptop. Built in tests enable you to characterize the integrity and performance of your Wi-Fi connection. Applications include:

Virtual Wifi Hotspot is a free software router for Windows based system running Windows 7, Windows 8, Windows Server 2008 R2 and Windows Server 2012.Using Virtual Wifi Hotspot, you can share any internet connection Via Wireless Internet my come from Wifi or LAN or Cable Modem or Dial-up or Cellular, etc.. The internet can be used by any Wifi device such as Laptop or desktop or Smart Phone or iPod Touch or iPhone or Ipad or Android Phone or Zune or Netbook or PS3 or wireless printer, etc.. These Wirelessls connecting devices can connect to Virtual Wifi Hotspot just like any other WiFi Router.Virtual WiFi hotspot is protected by Password and the underlaying security is WPA2 »

The Free Wi-Fi Coverage Mapping Site Survey Tool