WebGazer.js - Eye tracking on the browser
Watch2Gether - Watch2Gether is an app that allows multiple people to watch the same content simultaneously and interact with each other while watching.
Umoove - Face and eye tracking for mobile devices/gaming
Metastream - Watch streaming media with friends
Eye Yoga - Improve eyesight, relieve eye strain and prevent presbyopia.
StreamParty - StreamParty is a watch communiry, that allows you to watch video streams in sync with the people you care about, on multiple services.