I've only ever needed to use a tool like Wireshark a couple times, but when I needed it nothing else would do, and the convenience of being able to just download it and go instead of having to shepherd a purchase order through the organization was a lifesaver. It's one of many reasons why I am a big proponent of open-source software.

I had a "bearstein effect" moment just now. I had thought wireshark sold out. Like "Wireshark by Rapid7," but i just checked and it looks like they've stayed the FOSS course! Way to go!