Collection:
Display Apps
Switch display resolutions or adjust your screen brightness and colors (time-based) from the menu bar.
Check out these Mac Menu Bar Display Apps:
Collection:
Display Apps
Brightness Slider
Adjust the screen brightness right from your menu bar, just like the sound menu. The app gives you a smooth transition between low light and total darkness.
Collection:
Display Apps
Grayscale Mode
Collection:
Display Apps
HiddenMe
Collection:
Display Apps
Nocturnal
Nocturnal is a night shift menu bar app that includes darker than dark dimming, night shift fine tuning, and the ability to disable for custom time periods.