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.
netcat - Netcat is a featured networking utility which reads and writes data across network connections...
Komodia Relay - Free open source tool to perform TCP based session relay
Ettercap - Ettercap is a suite for man in the middle attacks on LAN.
Simple Port Forwarding - Simple Port Forwarding works with WebPages and not directly with your router.