Ping Meter Gadget - Customizable, graphical, semi-transparent ping (latency) meter.
NetSpeedMonitor - NetSpeedMonitor is a lightweight Network Monitoring Toolbar for your Windows Taskbar
PingDoctor - PingDoctor is software that is considered to be the most powerful and easiest to use network route analyzer.
FreeMeter - Monitor network bandwidth (C#.NET 2k/XP+). Desktop and Systray graph.
Open Nettest - Open Nettest is a platform for collecting, processing and visualizing data related QoS and QoE.
NetTraffic - Essential network bandwidth monitor.