Great list of the top 100 network security tools voted by 3243 users of the nmap-hackers mailing list. Every tool mentioned has a description, a homepage link to the developers, icons that tell you if it works on your system and if it costs money. All utilities belong to a category, you have the option to display every category. (like vulnerability scanners)
Top ten tools are Nessus, Wireshark (former Ethereal), Snort, Netcat, Metasploit Framework, Hping2, Kismet, TcpDump, Cain and Abel and finally John the Ripper.
This is a great collection of the most important network security tools of 2006.
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