Free - Look@Net.com

"easy Look at Packets" is a simple packets sniffer. Packets are filtered by incoming and outgoing, by IP addresses, ports and protocols - TCP, UDP, ICMP, IGMP. Programm does not demand installation and is very simple in management.
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$99.00 - SoftPerfect Research

SoftPerfect Network Protocol Analyzer is a professional tool for analyzing, maintaining and monitoring local networks and Internet connections. It captures the data passing through network card and represents this data in an easily readable form.
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$299.00 - Colasoft Co., Ltd.

Expert network analyzer designed for packet decoding and network diagnosis, Colasoft Capsa monitors the network traffic transmitted over a local host and a local network.
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$69.95 - IM Monitor Software

Monitor and Sniff Yahoo Messenge chat conversations on all computers in network, It is able to record conversations automatically in real time, And export all intercepted messages to HTML files
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