Venmon - Compact size system monitoring and multi-ping tool
Actimeter - Actimeter is a fun little app that tells you how active you've been at your computer. It tracks and counts all your computer-related activities and events, and turns them into a single, easy-to-understand number from 0 to 100.
StatusPilatus - Monitor your PC like never before!
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.
MenuBar Statistics - MenuBar Statistics is a lightweight app that sits quietly in your menu bar of macOS and displays computer information such as CPU, Disk, and Network, which is updated every 5 seconds.
Rainmeter - Rainmeter is a desktop customization platform.