NetLimiter - NetLimiter is an ultimate Internet traffic control and monitoring tool designed for Windows.
socat - socat is a relay for bidirectional data transfer between two independent data channels.
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
Bandwidth Manager - Bandwidth management, bandwidth limiting and traffic shaping software for Windows
AUTAPF - Reliable TCP and UDP port forwarding for Windows.