TCPView - TCPView is a Windows program that will show you detailed listings of all TCP and UDP endpoints on...
CurrPorts - CurrPorts displays the list of all currently opened TCP/IP and UDP ports on your local computer.
Total Network Monitor - Total Network Monitor is a network monitoring software that is designed to continuously monitor your local network, individual computers, and services. Free for 60 days.
Port Checker - Check open ports online
Netactview - Graphical network connections viewer for linux
CloseTheDoor - CloseTheDoor indentifies all the listening ports TCP/UDP over IPv4/v6 and the associated program...