Charmstone - The quicker switcher launcher for macOS

Lunar.fyi - Control monitor brightness, adapt using the ambient light sensor, adjust volume, switch inputs and turn off displays without fiddling with clunky buttons.

SwitchGlass - Customizable app switcher for Mac

DisplayBuddy - Control the real brightness of your monitors directly from your Mac - no need to touch the buttons on your Monitor.

Witch - Welcome to the world of W. i. t. c. h.

BetterDummy - BetterDummy creates a virtual display which you can utilize as a mirror main for your display on the Mac.