PortMapper - Do you need to map a specific TCP or UDP port on your machine to another port on another machine?
Simple Port Forwarding - Simple Port Forwarding works with WebPages and not directly with your router.
PFConfig - PortForward's PFConfig Software lets you forward ports on any router for any program.
Robusta Port Forwarder - This tool is created with the primary intention of making it easy to the end user to set forwarding rules in his router....
Portfwd - Portfwd, Port Forwarding Daemon, stands for port forwarding daemon.
Komodia Relay - Free open source tool to perform TCP based session relay