F.lux

F.lux

F.lux is a software that adjusts the brightness of your monitor based on the time of day. During the day, computer screens look good, they’re designed to look like the sun. At night they are to bright. F.lux makes the color of your computer’s display adapt to the time of day, warm at night and like sunlight during the day.

Homepage: http://www.stereopsis.com/flux