It is a free and one of the best Data Analytics and visualization tool in Excel.
The other Data Analysis tools are Wolfram Alpha, Google Search Operators, Solver and Dataiku DSS, R Programming, Python, SAS, Apache Spark, RapidMiner, QlikView, GA 360, Adobe and Spunk.
Eye tracking is a Data Analytics technology that is now gaining popularity.
A computer that is fitted with an eye tracking can detect what the user is looking at and provide valuable insights into the gaze patterns of your website users. It consists of sensors as well as algorithms.