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Komodia Relay - Free open source tool to perform TCP based session relay
SmartSniff - SmartSniff is a packet sniffer that capture TCP/IP packets and display them as sequence of conversations between clients and servers.
socat - socat is a relay for bidirectional data transfer between two independent data channels.
tcpdump - tcpdump is a common packet analyzer that runs under the command line.
PortMapper - Do you need to map a specific TCP or UDP port on your machine to another port on another machine?
Packet Sender - Packet Sender can send and receive UDP, TCP, and SSL on the ports of your choosing.