Desktop Dimmer is described as 'Enable darker-than-dark dimming for internal and external screens' and is a Screen Dimmer in the system & hardware category. There are more than 25 alternatives to Desktop Dimmer for a variety of platforms, including Windows, Linux, Mac, Android and Wayland apps. The best Desktop Dimmer alternative is f.lux, which is free. Other great apps like Desktop Dimmer are Redshift, LightBulb, Red Moon and Dimmer.
Small GTK GUI application to set contrast, brightness and gamma for wayland compositors which support the wlr-gamma-control protocol extension. Basically this is the example from here: https://github.com/swaywm/wlroots/blob/master/examples/gamma-control.
