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.
Paessler PRTG - An advanced network monitoring solution to monitor network up/downtime, traffic and usage.
TCP Optimizer - SpeedGuide.net - The Broadband Guide. Cable modems, DSL, Wireless, Network security. Free speed tweaks and TCP/IP tools for optimizing system performance.
TCPEye - TCPEye is an easy-to-use monitoring application that will display a list of all network processes.
PingPlotter - PingPlotter is a troubleshooting tool that helps IT professionals and neophytes identify, diagnose, and resolve network issues.