The EyeTribe tracker is really cheap, and you can now use it in Python and in Matlab. It’s not as bad as you would expect from its price, and you could probably use it in fixation or pupillometry studies. For in-depth info, read this validation study.
PyGaze Analyser is a new (basic) tool to create gaze data visualisations such as heatmaps. The code is open source and free to use. Read the post for example images and the download link!
The mantis shrimp has the most incredible eyes on earth, and is a blood-thirsty killer with supersonic claws. This post summarises pop culture and scientific views on this amazing animal.
Building your own eye tracker for dirt cheap. How hard can it be? Turns out the basics are surprisingly simple! This post explains how, including demo videos and source code.