NetStumbler
Netstumbler also famously known as Network Stumbleris a good tool which acilitates dedecting of Wireless Lans using the 802.11b, 802.11a and 802.11g WLAN standards it runs on microsoft OS from Win98 - Win Vista, there is anothere version called Mini Stumbler which is available for the handheld Windows CE operating System.
you can get it here
Aircrack
The fastest available WEP/WPA cracking tool
Aircrack is a suite of tools for 802.11a/b/g WEP and WPA cracking. It can recover a 40 through 512-bit WEP key once enough encrypted packets have been gathered. It can also attack WPA 1 or 2 networks using advanced cryptographic methods or by brute force. The suite includes airodump (an 802.11 packet capture program), aireplay (an 802.11 packet injection program), aircrack (static WEP and WPA-PSK cracking), and airdecap (decrypts WEP/WPA capture files).
you can get Aircrack here (aircrack-ng-1.0-rc3) -- rapid
Airsnort
802.11 WEP Encryption Cracking Tool
AirSnort is a wireless LAN (WLAN) tool that recovers encryption keys. It was developed by the Shmoo Group and operates by passively monitoring transmissions, computing the encryption key when enough packets have been gathered. You may also be interested in the similar Aircrack.
you can get AirSnort here
Cowpatty
This Cowpatty is good brute force tool for cracking WPA-PSK, considered the "New WEP" for home Wireless Security. This program simply tries a bunch of different options from a dictionary file to see if one ends up matching what is defined as the Pre-Shared Key.
you can get Cowpatty here
Asleap
This Tool is really good for when the network is using Leap. this tool can be used to gather the authentication data that is being passed across the network, and these sniffed credentials can be cracked. LEAP doesn't protect the authentication like other "real" EAP types, which is the main reason why LEAP can be broken
you can get LEAP here
Ethereal
Ethereal is used by all around the world by both Wind0s and opensource Operating system, its used for troubleshooting, analysis, software and protocol development, and education. It has all of the standard features you would expect in a protocol analyzer, and several features not seen in any other product. Its open source license allows talented experts in the networking community to add enhancements
you can download Ethereal here
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