While it is far more than a security tool, Google's massive database is a gold mine for security researchers and penetration testers. You can use it to dig up information about a target company by using directives such as “site:target-domain.com” and find employee names, sensitive information that they wrongly thought was hidden, vulnerable software installations, and more. Similarly, when a bug is found in yet another popular webapp, Google can often provide a list of vulnerable servers worldwide within seconds. Check out the Google Hacking Database and Johnny Long's excellent book: Google Hacking for Penetration Testers.
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