Simple Port Forwarding - Simple Port Forwarding works with WebPages and not directly with your router.
socat - socat is a relay for bidirectional data transfer between two independent data channels.
Portfwd - Portfwd, Port Forwarding Daemon, stands for port forwarding daemon.
AUTAPF - Reliable TCP and UDP port forwarding for Windows.
netcat - Netcat is a featured networking utility which reads and writes data across network connections...
Port Map - TheCodingMonkeys, authors of software like SubEthaEdit.