Network Security Tools

THC-Hydra

A very fast network logon cracker which support many different services.
See feature sets and services coverage page – incl. a speed comparison against ncrack and Medusa
Current Version: 7.1
Last update 2011-10-01

http://freeworld.thc.org/thc-hydra/

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Medusa

Medusa is intended to be a speedy, massively parallel, modular, login brute-forcer. The goal is to support as many services which allow remote authentication as possible. The author considers following items as some of the key features of this application:
http://www.foofus.net/~jmk/medusa/medusa.html

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W3af

w3af is a Web Application Attack and Audit Framework. The project’s goal is to create a framework to find and exploit web application vulnerabilities that is easy to use and extend. To read our short and long term objectives, please click over the Project Objectives item in the main menu. This project is currently hosted at SourceForge , for further information, you may also want to visit w3af SourceForge project page .
http://w3af.sourceforge.net/

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Metasploit

A collaboration of the open source community and Rapid7, Metasploit® software helps security and IT professionals identify security issues, verify vulnerability mitigations, and manage expert-driven security assessments.
http://www.metasploit.com/

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Rapid7

Simplifies network discovery and vulnerability verification, increasing the effectiveness of vulnerability scanners such as Nexpose — for
free.
http://www.rapid7.com/