Password Analysis

I noticed that there was a sort of password analysis running during some "change
password" procedure, where it was telling the "goodness" of a password on a
scale. If I entered a good mix of capitals and numbers and lowercase, of
course, the "goodness" was best.

My question is whether there is some command-line program that does this
analysis, or if there is a library, that the GUI (I think it was GTK or Gnome)
was using.

Thanks,
Rod