TCPView - TCPView is a Windows program that will show you detailed listings of all TCP and UDP endpoints on...
PortMapper - Do you need to map a specific TCP or UDP port on your machine to another port on another machine?
Connections Viewer - Connections Viewer is a useful network software utility with the primary focus of listing (and managing) both UDP and TCP connections inside the host system.
Komodia Relay - Free open source tool to perform TCP based session relay
CurrPorts - CurrPorts displays the list of all currently opened TCP/IP and UDP ports on your local computer.
Simple Port Forwarding - Simple Port Forwarding works with WebPages and not directly with your router.