TrafficMonitor - TrafficMonitor is a network monitoring suspension window software in Windows.
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.
NetSpeedMonitor - NetSpeedMonitor is a lightweight Network Monitoring Toolbar for your Windows Taskbar
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
FreeMeter - Monitor network bandwidth (C#.NET 2k/XP+). Desktop and Systray graph.
Better Uptime - We call you when your website goes down