I have rewritten Sifar, a gem that validates and generates strong passwords. The last version was based on one of my old PHP libraries, and it felt clumsy when simply ported to ruby.
Sifar gives you a lot of control over the parameters that make a password weak or strong. You can check for passwords that sound or spell similar to a given word (like user name), apart from the usual checks for length, dictionary words, etc.
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