NetLimiter - NetLimiter is an ultimate Internet traffic control and monitoring tool designed for Windows.
TCPView - TCPView is a Windows program that will show you detailed listings of all TCP and UDP endpoints on...
NetBalancer - NetBalancer is a Windows application for local network traffic control and monitoring.
Fping (open source) - fping is a program to send ICMP echo probes to network hosts, similar to ping, but much better performing when pinging multiple hosts.
Bandwidth Manager - Bandwidth management, bandwidth limiting and traffic shaping software for Windows
Open Nettest - Open Nettest is a platform for collecting, processing and visualizing data related QoS and QoE.