Kismet 2010-01 R1

Kismet is an 802.11 layer 2 wireless network sniffer. It can sniff 802.11b,
802.11a, and 802.11g traffic. It is capable of sniffing using almost any
wireless card supported in Linux, which currently divide into cards handled by
libpcap and the Linux-Wireless extensions (such as Cisco Aironet), and
cards supported by the Wlan-NG project which use the Prism/2 chipset (such as
Linksys, Dlink, and Zoom). Besides Linux, Kismet also supports FreeBSD,
OpenBSD and Mac OS X systems. Features Multiple packet capture sources,
Runtime network sorting by AP MAC address (bssid), IP block detection via
ARP and DHCP packet dissection, Cisco product detection via CDP, Ethereal and
tcpdump compatible file logging, Airsnort-compatible "interesting"
(cryptographically weak) logging, Secure SUID behavior, GPS devices and
wireless devices fingerprinting. Kismet also includes a tool called gpsmap that
can be used to create maps from logged GPS data.

Download
Here