Ping Meter Gadget - Customizable, graphical, semi-transparent ping (latency) meter.
NetSpeedMonitor - NetSpeedMonitor is a lightweight Network Monitoring Toolbar for your Windows Taskbar
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.
TrafficMonitor - TrafficMonitor is a network monitoring suspension window software in Windows.
Open Nettest - Open Nettest is a platform for collecting, processing and visualizing data related QoS and QoE.
Network Lights - Network Lights is a Windows program, which blinks keyboard LEDs (Light Emitting Diode) indicating outgoing and incoming network packets on network interface.