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It is not always straightforward to generate strong passwords, but thanks to the use of dedicated software for this purpose it gets easier. The Doorman is one of these applications, designed for use on Mac OS X.
The Doorman allows to create passwords using numbers, letters (uppercase and lowercase) and special characters (that can be user defined).
The password generated by Doorman is always evaluated on their level of security and this information is presented in a quality bar.
It`s freeware, by the way ;)
*image not mine*
Source link: http://mr-fridge.de/software/doorman/index.php