TCP Listener
(click to download)

Enter a port number and a description and any scanners on that port will see your description. Minimizes to the tray. Each connection is logged. TCP Listener is a great tool for testing security on your system. A great way to test the security of your firewall is to set TCP Listener to listen on different ports and then run a port scanner and see if it can connect through your firewall. No need to install, runs right from the exe file. Requires the .NET Framework from Microsoft.