Wireshark - Wireshark is a network protocol analyzer for Unix and Windows. It lets you capture and interactively browse the traffic running on a computer network.
NetLimiter - NetLimiter is an ultimate Internet traffic control and monitoring tool designed for Windows.
netcat - Netcat is a featured networking utility which reads and writes data across network connections...
NetBalancer - NetBalancer is a Windows application for local network traffic control and monitoring.
Ettercap - Ettercap is a suite for man in the middle attacks on LAN.
NetSpeedMonitor - NetSpeedMonitor is a lightweight Network Monitoring Toolbar for your Windows Taskbar