RPi-Monitor - RPi-Monitor is a tool that provides all the connected system peripherals properties and current metrics.
Venmon - Compact size system resources monitoring utility and multi-ping tool for Windows
TinyResMeter - TinyResMeter is a small tool that displays useful information about system resources in real time...
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.
Mousotron - Mousotron is a mouse and keyboard activity monitor and keeps statistics of your mileage. It's like an odometer or tripometer for your mouse cursor.
Scout - Scout ♥ monoliths.