FOVE - An eye tracking virtual reality headset (pre-launch)

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.

WebGazer.js - Eye tracking on the browser

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

Breaks For Eyes - A Mac app to get rid of eye strain, dry eyes and fatigue

f.lux for iOS - Auto adjust your iOS display based on the time of day