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socat - socat is a relay for bidirectional data transfer between two independent data channels.
Simple Port Forwarding - Simple Port Forwarding works with WebPages and not directly with your router.
Komodia Relay - Free open source tool to perform TCP based session relay
AUTAPF - Reliable TCP and UDP port forwarding for Windows.
Port Map - TheCodingMonkeys, authors of software like SubEthaEdit.
Packet Sender - Packet Sender can send and receive UDP, TCP, and SSL on the ports of your choosing.