analyzer

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NetProbe

http://www.objectplanet.com/probe/ Do you know what's really traveling through your network ?

PIAFCTM

NetworkActiv PIAFCTM is a network data capturing utility that provides both packet capturing and HTTP (Web) based file capturing. http://www.networkactiv.com/PIAFCTM.html
http://www.tamos.com/products/commview/

CommView

Overview
Ultra Network Analyzer from GJPSoft is a powerfully network sniffer ,packet sniffer, sockets sniffer and protocol sniffer tools. It consists of a well-integrated set of functions that you can use to resolve network problem. http://www.gjpsoft.com/UltraNetSniffer/index.htm

Ultra Network Sniffer