Impossible not to mention. Ethereal – these days known as Wireshark – is twenty! In 1998 Gerald Combs publicly released its first version 0.2.0. And he truly changed the IT (and particulary telco) world. Over the years Wireshark has won several industry awards, and it is one of the top-rated sniffers. Wireshark is a real gift for every engineer who works with a protocol stack. At the same time many BIG companies don’t even realize what contribution Wireshark means to their daily business!
Wireshark
Thank you Gerald and everyone who has helped with this great project!
Real Time Communication 
… and I use it almost as much as my Office suite 🙂
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