Any recommendation for a good free network penetration test tool?

I've been asked to conduct network penetration testing.  Does anyone recommend a good free network penetration tool?  I've downloaded a few, but haven't really found one I like.
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denver218Asked:
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BiniekCommented:
You should start with these tools:

BackTrack Linux – Penetration Testing Distribution
http://www.backtrack-linux.org/

KALI Linux - penetration testing distribution
http://www.kali.org/
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Hassan BesherCommented:
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SunBowCommented:
Take a look here: http://www.concise-courses.com/security/top-ten-pentesting-tools/

From that list I mainly recollect nmap as being a generally favorable tool for administrator. But your currently used platforms may have needs that are different from some others, not only for OS but for wireless connections, which, if used, could better justify exploring tools specific to that than those for more general firewall testing tools.

Also here: http://www.softwaretestinghelp.com/penetration-testing-tools/ -37 listed

One standout on that list is Nessus. Use the descriptions to best make up your own list of what to check, such as whether or not you have MS SQL.

Highly advisable, do hesitate before clicking on anything that may be downloadable (ex: hover), for the topic itself lends to abuse from some malwares, it is all too easy to pretend to be proper source or modify someone's link posted on web, including use of redirect, loading of tracking or search tool.
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RafaelCommented:
You an use Nesus, NMAP, Tenable, Retina (Free version) as well as Tripwire's secure Scan. It's hosted provides support and is free. It is a combination of more than one two set.
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SandyCommented:
I would suggest to go with.. Nexpose with Metasploit..

Further you can check with

http://www.opensourceforu.com/2012/02/top-10-security-assessment-tools/

TY/SA
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madunix (Fadi SODAH)Chief Information Security Officer Commented:
I do Kali and BT Linux ...
1.      Nessus (Linux if you can) http://www.nessus.org/nessus/
2.      Nikto (Linux) http://www.cirt.net/nikto2
3.      Paros proxy (Linux if you can) http://www.parosproxy.org/index.shtml
4.      Ike-scan (Linux) http://www.nta-monitor.com/tools/ike-scan/
5.      SARA (Security Auditor's Research Assistant) (Linux) http://www-arc.com/sara/
6.      MBSA (discutable) http://technet.microsoft.com/en-us/security/cc184923.aspx
7.      BT http://www.linux-magazine.com/w3/issue/77/BackTrack.pdf
8.      skipfish http://code.google.com/p/skipfish/
9.      Mcafee http://www.mcafee.com/us/downloads/free-tools/index.aspx
10.    Kali http://www.kali.org/
11.    Meta http://www.metasploit.com/

Have a look at the existing list in the Penetration Testing Execution Standard's Technical Guidelines:  http://www.pentest-standard.org/index.php/PTES_Technical_Guidelines
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Aahna jainCommented:
Some pf most effective tools are here for penetration testing:
 1)nmap.org
2)nessus.org
3)metasploit.com framework
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