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
CurrPorts - CurrPorts displays the list of all currently opened TCP/IP and UDP ports on your local computer.
PortsMonitor - PortsMonitor is a system utility for monitoring system TCP/IP network connections by application...
TCPView - TCPView is a Windows program that will show you detailed listings of all TCP and UDP endpoints on...
TcpView For Linux - TcpView For Linux. Touch screen friendly design graphical network connections viewer for Linux.
NetStat Agent - At whatever point you open a site association through your program or download documents, you are opening TCP/UDP connions.