Vistumbler is an open source stumbler for Windows, supporting just the 2.4GHz band.

The Android app also offers some channel analysis in addition to the AP details and signal graphs. The Office edition adds a channel table that shows some useful analysis, such as overlapping, and the analyze page shows alerts on potential issues, like low signal or weak security. All InSSIDer editions show the near-by APs and usual list of details and graphs of channel usage for both the 2.4GHz and 5GHz bands. Plus they offer a Mac OS X app ($4.99) and a free Android app. For InSSIDer they offer two Windows editions: a free Home edition and a more advanced Office edition. InSSIDer is a free Wi-Fi stumbler from MetaGeek, the maker of the Wi-Spy spectrum analyzer and many other network products. It supports GPS positioning, shows hidden network SSIDs, and detects known and default AP configurations. It supports distributed remote sniffing with Kismet drones in a client/server modular architecture. It supports standard PCAP file logging, which can be exported to Wireshark, Tcpdump, and other popular network protocol analyzers. It works with any wireless card which supports raw monitoring (rfmon) mode, but there are limitations when used in Windows. Kismet is a wireless network sniffer, analyzer, stumbler and intrusion detection system that can run on multiple platforms, including Linux, Mac OS X, and Windows. It also features some powerful filtering functions, decryption support for many protocols, and offers VoIP analysis. It supports reading/writing from/to many different capture file formats and supports exporting to a few different formats. It can capture and/or show the data packets for Ethernet, Wi-Fi, Bluetooth, and other hundreds of other network protocols, depending upon the platform and network adapter you’re using. Wireshark (Formally Ethereal) is a popular network protocol analyzer. Here you’ll discover free network sniffers, analyzers, and stumblers for Windows, Mac, Linux, and even Android.

You can use them during site surveys, installs, troubleshooting, and even auditing. There are many commercial network tools out there offering all the bells and whistles, but sometimes a simpler product will do the job.

Wifi network sniffer mac