netcat - Netcat is a featured networking utility which reads and writes data across network connections...
TrafficMonitor - TrafficMonitor is a network monitoring suspension window software in Windows.
PortMapper - Do you need to map a specific TCP or UDP port on your machine to another port on another machine?
NetBalancer - NetBalancer is a Windows application for local network traffic control and monitoring.
Komodia Relay - Free open source tool to perform TCP based session relay
NetTraffic - Essential network bandwidth monitor.