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Opinion: For the price, the Nessus tool is simply amazing. The upside is
that the tool is completely free, but the downside is that there is no
one to call for support. This tool has every bit of the functionality of
the much more expensive pay tools but none of the cost. Nessus is a
must-have tool.
Cisco Secure Scanner
URL: http://www.cisco.com
Price: ($–$$$$)
Vendor’s comments: Cisco Secure Scanner (formerly NetSonar) is an enter-
prise-class software tool offering superior network system identification,
innovative data management, flexible user-defined vulnerability rules,
comprehensive security reporting capabilities, ...