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answers:

2

Anyone know of an eye-tracking library for C#, C/C++ or Objective-C? Open-source is preferable. Thanks.

+1  A: 

OpenCV could probably do it. It has the ability to perform face recognition, so eye tracking might be a subset of that.

Soo Wei Tan
Errr, why the downvote! He's 100% right, OpenCV provides the base functionality to creating eye tracking. Buy the book and go through it, it contains that specific example!
badbod99
+3  A: 

Here is a page full of eye-tracking resources, many of them open-source.

Naaff