NetSpeedMonitor - NetSpeedMonitor is a lightweight Network Monitoring Toolbar for your Windows Taskbar
Venmon - Compact size system resources monitoring utility and multi-ping tool for Windows
NetTraffic - Essential network bandwidth monitor.
RPi-Monitor - RPi-Monitor is a tool that provides all the connected system peripherals properties and current metrics.
FreeMeter - Monitor network bandwidth (C#.NET 2k/XP+). Desktop and Systray graph.
Curler by Amixr.IO - Curler by Amixr.IO is a lightweight tool that lets you monitor your website uptime by checking your site once per 10 minutes and let you know if it’s working or not.