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http://www.openwall.com/john/ John the Ripper is free and Open Source software, distributed primarily in source code form.

John the Ripper password cracker

http://www.nagios.org/products/enterprisesolutions/ Its true - Nagios is a powerful, enterprise-class monitoring solution. But monitoring alone won't allow you to manage your infrastructure effectively. Check out some of the other enterprise solutions that can complement Nagios and make your work easier.

Enterprise Management Solutions