VULNERABILITY ASSESSMENT TOOL : NESSUS

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Nessus is still the best UNIX vulnerability scanner available and among the best to run on Windows. Nessus is constantly updated, with more than 20,000 plugins. Key features include remote and local (authenticated) security checks, a client/server architecture with a GTK graphical interface, and an embedded scripting language for writing your own plugins or understanding the existing ones.

Download from Nessus Official Website:

http://www.nessus.org/download