Windows: Password Security Scanner from NirSoft is a program that does what its name suggests: Scans the passwords in Windows applications (Microsoft Outlook, Firefox, Internet Explorer, and more) and displays security information about the passwords—without actually showing you the passwords.
Thus, you can use the utility to audit password strength on others' computers or your own. Password Security Scanner displays the password's length and also the number of: numeric characters, lowercase letters, uppercase characters, non-alphanumeric characters, non-English characters, and repeating characters. It also assigns a password strength rating from 1 (very weak) to over 45 (very strong).
It's a portable program that can also scan passwords in Windows VPN/dialup, MSN/Windows Messenger, and Windows Live Mail in addition to the applications above. (More applications coming in future versions.)
Handy whether you've got several PCs to check or just want to quickly audit your own passwords.
Password Security Scanner | NirSoft