Windows free crack WEP-WPA/WPA2
Aircrack-ng is an 802.11 WEP and WPA-PSK keys cracking program that can recover keys once enough data packets have been captured. It implements the standard FMS attack along with some optimizations like KoreK attacks, as well as the all-new PTW attack, thus making the attack much faster compared to other WEP cracking tools.
Cain & Abel
Cain & Abel is a password recovery tool for Microsoft Operating Systems. It allows easy recovery of various kind of passwords by sniffing the network, cracking encrypted passwords using Dictionary, Brute-Force and Cryptanalysis attacks, recording VoIP conversations, decoding scrambled passwords, recovering wireless network keys, revealing password boxes, uncovering cached passwords and analyzing routing protocols. The program does not exploit any software vulnerabilities or bugs that could not be fixed with little effort. It covers some security aspects/weakness present in protocols standards, authentication methods and caching mechanisms; its main purpose is the simplified recovery of passwords and credentials from various sources, however it also ships some "non standard" utilities for Microsoft Windows users.
Auditor WiFi is a free program that audits the security of some wireless routers, if you find a specific vulnerability, you can plug and go (after asking permission, of course).
WPAMagickey Windows is a tool for auditing wireless networks. What it does is calculate the default WPA routers Zyxel and Comtrend.
CommView for WiFi is the wireless version of one of the most complete and best sniffers valued for Windows. It runs on Windows 7 (32 and 64 bit) and can monitor a network 802.11 a / b / g / n.
John the Ripper is a program to find weak passwords, currently available for UNIX, DOS and Win32.