The venerable iStumbler Wi-Fi sniffing software has been updated with support for 5 GHz networks and 802.11n. iStumbler lets you scan the area around you for Wi-Fi networks and Bluetooth devices, as well as exposing Bonjour services on any local networks to which you are connected. The new version, which works under Snow Leopard only, also adds GPS support for location-based tracking. Older versions of iStumbler that work with previous releases of Mac OS X still remain available. The software is free, but the author requests donations to support his work.

—Posted by Glenn Fleishman on March 15, 2010