PortMapper - Do you need to map a specific TCP or UDP port on your machine to another port on another machine?
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....
UPnP PortMapper - UPnP PortMapper is an open-source program that allows you to manage your internet router ports and mapping of a U Plug n Play enabled gateway device in your local network.
Komodia Relay - Free open source tool to perform TCP based session relay
Portmap.io - Expose your local PC to Internet from behind firewall and without real IP address