App Tamer automatically slows down or pauses your applications whenever you’re not using them, greatly reducing their CPU use.
AppPolice
This menu bar app lets you quickly throttle down the CPU usage of any running process or application.
Arch Info
This menu bar app tells you if the currently selected application is an Apple Silicon or an Intel (translated via Rosetta 2) application.
ARD Monitor
ARD Monitor shows the state of your Apple Remote Desktop (disabled, enabled, connected) – even if the Administrator asked for permission to monitor/control. You can also disconnect connected administrators. It displays your IP- and MAC-addresses, computer name and serial number.