Wireless 802.11b monitoring tool

 Kismet is a 802.11b wireless network sniffer. It is capable of sniffing
 using almost any supported wireless card using the Airo, HostAP, Wlan-NG,
 and Orinoco (with a kernel patch) drivers.
 .
 Can make use of sox and festival to play audio alarms for network events
 and speak out network summary on discovery. Optionally works with gpsd
 to map scanning.