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John the Ripper
John The Ripper password cracker
John the Ripper is a fast password cracker, currently available for many flavors of Unix (11 are officially supported, not counting different architectures), DOS, Win32, BeOS, and OpenVMS.

Its primary purpose is to detect weak Unix passwords.
Besides several crypt(3) password hash types most commonly found on various Unix flavors, supported out of the box are Kerberos AFS and Windows NT/2000/XP LM hashes, plus several more with contributed patches.

Lovingly referred to as "John" amoung its users.

Official John the Ripper homepage

Download John the Ripper for windows

to get password hashes out of Windows Nt/2K/XP you will also need pwdump3, this is not a hacking tools as it requires administrative rights on the server.
 
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