Network Lights - Network Lights is a Windows program, which blinks keyboard LEDs (Light Emitting Diode) indicating outgoing and incoming network packets on network interface.
Pingdom - With website monitoring from Pingdom you will be the first to know when your website is down. No installation required. 30-day free trial.
FreeMeter - Monitor network bandwidth (C#.NET 2k/XP+). Desktop and Systray graph.
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
trafficWatcher - trafficWatcher is a small tool to monitor your network activity.
Better Uptime - We call you when your website goes down