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Wireshark - Wireshark is a network protocol analyzer for Unix and Windows. It lets you capture and interactively browse the traffic running on a computer network.
tcpdump - tcpdump is a common packet analyzer that runs under the command line.
netcat - Netcat is a featured networking utility which reads and writes data across network connections...
Packet Peeper - Packet Peeper is a free network protocol analyzer (packet sniffer) for Mac OS X.
SmartSniff - SmartSniff is a packet sniffer that capture TCP/IP packets and display them as sequence of conversations between clients and servers.
NetworkMiner - NetworkMiner is a Network Forensic Analysis Tool (NFAT) for Windows.