Windows/Mac/Linux: Network analyzer Wireshark displays live packet data as it moves in and out of a network interface on your computer. Sound geeky? It is. Wireshark (nee Ethereal) is a network packet sniffer that reveals the nitty-gritty of DNS, TCP, UDP, HTTP and all those other networking acronyms. Useful for folks who want to learn more about network protocols, troubleshoot network problems or