PortsMonitor - PortsMonitor is a system utility for monitoring system TCP/IP network connections by application...
socat - socat is a relay for bidirectional data transfer between two independent data channels.
Proc Net Monitor - SecurityXploded is an Infosec Research Organization offering 200+ FREE Security/Password Recovery Tools, latest Research Articles and FREE Training on Reversing/Malware Analysis
Simple Port Forwarding - Simple Port Forwarding works with WebPages and not directly with your router.
CurrPorts - CurrPorts displays the list of all currently opened TCP/IP and UDP ports on your local computer.
PortMapper - Do you need to map a specific TCP or UDP port on your machine to another port on another machine?