Vistumbler!

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.

NetStumbler is a tool for Windows that allows you to detect Wireless Local Area Networks (WLANs) using 802.11b, 802.11a and 802.11g. It has many uses:Verify that your network is set up the way you intended, find locations with poor coverage in your WLAN, detect other networks that might be causing interference with your network, detect unauthorized "rogue" access points in your workplace, help aim directional antennas for long-haul WLAN links & use it recreationally for WarDriving.Does not work well with Win7. This software has not been updated in years and harkens back to Win Vista days. »

Acrylic WiFi Free v2.2 for Windows is an advanced Wi-Fi scanner that is able to gather real-time WLAN information and perform network analysis. The main difference between Acrylic and other WiFi tools is that supports "monitor mode" what means that you can capture all wireless packets and gather information about wireless devices, such as connected clients.

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.

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.

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. »

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.

How strong is your WiFi signal?

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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.

NetSurveyor is a diagnostic tool that falls under the category of WiFi Scanners or 802.11 Network Discovery Tools. The best known in this category is NetStumbler . A discovery tool reports the Service Set Identifier (SSID) for each wireless network it detects, along with the channel used by the access point (AP) servicing that network. The way this works is that roughly every 100 mSec an AP sends an “I’m here” beacon – and the discovery tool (running on your laptop and using its 802.11 wireless adapter, also known as a station or STA) picks-up that beacon and adds the SSID to its list of known wireless networks. In addition, the discovery tool reports the RSSI (Received Signal Strength Indication) for each AP, which is roughly an indication of how close the AP is to your current location (i.e. how close it is to the client STA). Just to be clear, the RSSI reflects the strength of the beacon as received by the STA – it is not an indication of performance. »

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

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 »

netsniff-ng is a free, performant Linux networking toolkit. The gain of performance is reached by zero-copy mechanisms, so that on packet reception and transmission the kernel does not need to copy packets from kernel space to user space and vice versa. It contains the utilities netsniff-ng, trafgen, mausezahn, bpfc, ifpps, flowtop, curvetun, astraceroute.