The Eye Tribe Tracker is an aftermarket eye tracker currently available for Windows-based tablets and computers and serves many functions from gaming to reading. We first told you about this inexpensive eye tracking device about a week ago when they opened up pre-ordering for the Surface Pro version on September 6th. However, I had a chance to speak with company partner Sebastian Sztuk — an engineer by trade and maker of most of the company’s prototypes — at TechCrunch Disrupt SF 2013. He showed me a pretty cool demo and let me know that the company’s strategy is actually larger than the external unit we tested.