"Telepathwords
Preventing weak passwords by reading your mind "
https://telepathwords.research.microsoft.com/
Personally I'm not that sure lots of people spend time trying to crack passwords -- rather than cracking just one password they'll spend their time getting thousands or millions from the sites that store them, or else like the last batch of stolen & posted passwords to hit the news, they'll infect [in this case a million + ?] systems, installing key loggers.
That said, this site posted by Microsoft Research will allegedly tell you just how easy your password is to guess.