Scapy - Scapy is a powerful interactive packet manipulation program.
socat - socat is a relay for bidirectional data transfer between two independent data channels.
Winsock Packet Editor - WPE Pro is a packet editor.
Komodia Relay - Free open source tool to perform TCP based session relay
Nipper - Nipper - Neat Internet Protocol Packet EditoR - is a graphical packet generation tool.
Simple Port Forwarding - Simple Port Forwarding works with WebPages and not directly with your router.