Kismet!

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.

Wifi Analyzer is a handy tool which helps you to select a better channel for your wireless router. It turns you android phone into a handy Wi-Fi analyzer!

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

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. »

Intercepter-NG is a multifunctional network toolkit for various types of IT specialists.The main purpose is to recover *interesting* data from the network stream and perform different kinds of MiTM attacks.

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.

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.

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...

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. »

Reaver implements a brute force attack against Wifi Protected Setup (WPS) registrar PINs in order to recover WPA/WPA2 passphrases. Reaver has been designed to be a robust and practical attack against WPS, and has been tested against a wide variety of access points and WPS implementations. On average Reaver will recover the target AP's plain text WPA/WPA2 passphrase in 4-10 hours, depending on the AP. In practice, it will generally take half this time to guess the correct WPS pin and recover the passphrase. »

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. »

wavemon is a wireless device monitoring application that allows you to watch signal and noise levels, packet statistics, device configuration and network parameters of your wireless network hardware. It should work (though with varying features) with all devices supported by the Linux wireless kernel extensions by Jean Tourrilhes.

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

How strong is your WiFi signal?

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.