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Kiwi application monitor - Kiwi application monitor is a small program which lets you monitor your applications/processes, Windows and User activity.
iStat Menus - "An advanced Mac system monitor for your menubar."
Battle Encoder Shirase - Software that controls per-process CPU usage: an “active” software CPU cooler.
Stats - Simple macOS system monitor in your menu bar.
Processes - https://www.oneperiodic.com/products/processes/
MenuBar Stats - Advanced Mac system monitor right from the menu bar