These three software try to emulate the ocular behavior considering the elements showed on the screen.
Despite promising good results, some tests show that they are very far away from the reality. Aga shares their own results testing Ebay:
http://www.rosenfeldmedia.com/books/eye-tracking/blog/participant-free_eye_tracking/
A main error would be that "For example, the simulations predict a lot of attention on images (including advertising), whereas the study participants barely even looked at many of those elements"
www.gazehits.com is not an eyetracker simulator, it is a prediction tool based on one of the best saliency models AWS (Adaptive Whitening Saliency).
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