WebGazer.js - Eye tracking on the browser
Dark Reader - Reduce eye strain in your browser with this extension that provides a dark theme for browsing.
FOVE - An eye tracking virtual reality headset (pre-launch)
Night Eye - Night Eye is a browser extension that enables dark mode on any website you visit. It does not ruin your browsing experience by simply inverting images.
Breaks For Eyes - A Mac app to get rid of eye strain, dry eyes and fatigue
Dark Mode - A global dark theme for the web