Nmap author Fyodor has compiled a list of the Top 100 Network Security Tools, as tabulated in a survey of nmap-hackers mailing list members. I remember when the previous lists were published in 2000 and 2003, and each release has led to my discovery of new tools, or reminded me that it's time to go back and revisit some old ones. I'd have to agree with the statement that "Anyone in the security field would be well advised to go over the list and investigate tools they are unfamiliar with. I discovered several powerful new tools this way."

found via: [Geeks are Sexy]