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 can be used to
Verify that your network is set up the way that you intended.
Find locations with poor coverage in your WLAN.
Detect other networks that may be causing interference on your network.
Detect unauthorized access points in your workplace.
Help aim directional antennas for long range WLAN links.
http://www.netstumbler.com/downloads/http://airsnort.shmoo.com AirSnort is a wireless LAN (WLAN) tool which recovers encryption keys.
AirSnort operates by passively monitoring transmissions and then computing the encryption key when enough packets have been gathered.
http://sourceforge.net/projects/wepcrack WEPCrack is a software tool that cracks 802.11 WEP encryption keys using the latest discovered weakness of RC4 key scheduling.
http://www.grape-info.com/doc/win2000srv/security/aircrack-2.3.htmlAircrack-2.3 Windows (Wireless WEP crack)
Aircrack is a set of tools for auditing wireless networks:
http://www.kismetwireless.net/Kismet is an 802.11 layer2 wireless network detector, sniffer, and intrusion detection system. Kismet will work with any wireless card which supports raw monitoring (rfmon) mode, and can sniff 802.11b, 802.11a, and 802.11g traffic." It will work on most Linux and Unix platforms.
http://weplab.sourceforge.net/WepLab is a tool designed to teach how WEP works, what different vulnerabilities has, and how they can be used in practice to break a WEP protected wireless network. So far, WepLab more than a WEP Key Cracker, is a WEP Security Analyzer designed from an educational point of view. The author has tried to leave the source code as clear as possible, running away from optimizations that would offuscate it." "Weplab works under any flavor of Linux for i386 and PPC, MacOSX and Windows NT/2000/XP."