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Komodia Relay - Free open source tool to perform TCP based session relay
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.
socat - socat is a relay for bidirectional data transfer between two independent data channels.
Winsock Packet Editor - WPE Pro is a packet editor.
PortMapper - Do you need to map a specific TCP or UDP port on your machine to another port on another machine?
Nipper - Nipper - Neat Internet Protocol Packet EditoR - is a graphical packet generation tool.