Telling people about the virtues of open source security tools is like selling people on ice cream sundaes: It doesn’t take much of a sales pitch — and most people are convinced before you start.

It’s probably not surprising that most security professionals are already using open source solutions to put a cherry on top of their existing security infrastructure. From Wireshark to OpenVAS and Kali Linux, open source software is a key component in many security practitioners’ arsenal.