Top 75 Network security tools

Out of the Top 75 Network Security Tools listed on the page I have only NOT heard of 8 of the top 50. I’ve used probably half of the ones listed, the ones that I haven’t used are mainly the linux based ones but that will change over the next few months. (I’ve downloaded and played with Nmap recently – the front end to this makes light work of scanning a network although I still prefer GFI’s Scanner.