Flux - Application Architecture for Building User Interfaces

f.lux - f. lux is a piece of software for Windows, Mac, Linux, iOS, and Android that provides a blue light filter over your screen. Research suggests limiting our exposure to blue light in the hours before bedtime can help us fall asleep faster.

Mata - The night vision for the web. Read easier on the eyes.

CareUEyes - CareUEyes is an eye protection software for windows that comes with blue light filter, screen dimmer, and break reminder

Dimmy - Dim your extra monitors to avoid distractions

Dimmer - A very small and free utility for Windows to reduce brightness on LCD/TFT screens.