The simply the best collection of password strength scripts
jQuery password strength meter is a small plugin to jQuery that provides an easy way to show the strength of a user's (intended) password.
A plugin for Twitter Bootstrap that provides rulesets for visually displaying the quality of a user's typed in password.
This plugin shows the strength of you passwords by telling you how long time it would take to brute force them.
Bootstrap Strength Meter uses Password Score to give a realistic estimate of the strength of a password.