TrafficMonitor - TrafficMonitor is a network monitoring suspension window software in Windows.
FreeMeter - Monitor network bandwidth (C#.NET 2k/XP+). Desktop and Systray graph.
NetSpeedMonitor - NetSpeedMonitor is a lightweight Network Monitoring Toolbar for your Windows Taskbar
trafficWatcher - trafficWatcher is a small tool to monitor your network activity.
NetBalancer - NetBalancer is a Windows application for local network traffic control and monitoring.
GlassWire - Visualize network activity in detail, get notified when new apps access the network, look out for...