Name some of the most innovative, useful and, arguably, best network security tools.
There are many tools around, and typical suspects are already shared (Nmap, Wireshark, Snort, Bro, etc). Depending on what you specifically want to achieve, you will have to dive into the niche areas of security tools. I’m working on a project (Linux Security Expert) with a security tools section, to categorize, group, and score them. Hopefully that gives you and others inspiration on the availability of security tools.