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.

EasyRes - EasyRes is a fast screen resolution switcher for Mac OS X with live animated previews.

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

SwitchResX - SwitchResX is a tool designed to manage resolutions of all your monitors and HDTVs.

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

QuickRes - The best way to change resolutions on your Mac