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Wireshark is the world's foremost network protocol analyzer, and is the de facto (and often de jure) standard across many industries and educational institutions. (Wireshark was known as Ethereal until June 09, 2006)
GroinK is an advanced sniffer that supports protocol deconding and MiTM attacks. Unlike other sniffers, Groink uses lua as scripting language that allows you to extend it easily.