inSSIDer is described as 'A network analyzer designed for modern Wi-Fi environments, showing physical and logical views, signal strength, channel recommendations, and filtering options' and is a very popular network analyzer in the network & admin category. There are more than 25 alternatives to inSSIDer for a variety of platforms, including Windows, Mac, Android, Linux and iPhone apps. The best inSSIDer alternative is NetSpot. It's not free, so if you're looking for a free alternative, you could try Homedale or Vistumbler. Other great apps like inSSIDer are Acrylic Wifi, Kismet, WiFi Explorer and WiFi Analyzer - VREM.
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...
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.
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.
LinSSID is graphically and functionally similar to iwscanner (Linux) and Inssider (Microsoft™ Windows®). It is written entirely in C++ using Linux wireless tools and Qt4.
LinSSID is the most similar to inssider
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:
Tanaza, an Italian company, developed an intuitive and responsive cloud-based management software for IT professionals to operate Wi-Fi networks. At the core of Tanaza's technology is TanazaOS, a powerful Linux-based Operating System compatible with multiple wireless access...
It's for creating and monetizing networks, not managing and diagnosing them.
Scan your wifi network and obtain troubleshooting details, with extreme granularity.
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...
It's easy to use, shows clear Signal to noise ratios
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...
Scanning for wireless networks is now easier and more personalized! AirRadar allows you to scan for open networks and tag them as favourites or filter them out. View detailed network information, graph network signal strength, and automatically join the best open network in...
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...
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Another good (commercial/paid) alternative to InSSIDer. This too (similar to WiFi Explorer) shows list of WiFi sources and graphs of signal strengths. Also lists connected devices.