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.

ClearMind - Cognitive enhancement supplement

Redshift - Redshift is an award-winning, production ready GPU renderer for fast 3D rendering and is the world's first fully GPU-accelerated biased renderer.

LightBulb - Background application that adjusts screen gamma, making the colors appear warmer at night...

Stack Exchange - Stack Exchange is a fast-growing network of 84 [and counting] question and answer sites on diverse...

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