Top 100 Network Security Tools
After conducting a survey of Nmap users from the nmap-hackers mailing list to determine their favorite security tools, the guys at Insecure.org compiled the results and released them to the world in this fantastic top 100 list. Security practitioners are strongly encouraged to read the list and investigate tools they aren't familiar with. Who knows, you may find the little gem that you never knew about in there.
Check it out.