50 Must-Have Open Source Tools for Security

“32. Nmap
“Nmap quickly takes inventory of your entire network, no matter
what the size. As a result, security audits are easier and updates
are simplified. Operating System: Windows, Mac, Linux, Unix, BSD,
Solaris.

33. Angry IP Scanner
“This fast, simple tool scans IP addresses and ports to provide
information about your network. And if you need additional
information other than what’s provided with the standard tool, it’s
easy to write extensions. Operating System: Windows, Mac,
Linux.

34. Honeytrap
“Honeytrap is designed to give you an early warning of an attack.
It collects and displays data about possible attacks, but does not
block intrusions. Operating System: Linux, BSD”

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