Heatmap and other tools for Google Maps.
https://developers.google.com/maps/documentation/javascript/visualization
Mapping
Get access to data on 10,308 websites that are Google Visualization Library Customers. We know of 4,439 live websites using Google Visualization Library and an additional 5,869 sites that used Google Visualization Library historically and 2,415 websites in the United States.
Get a list of 10,308 websites using Google Visualization Library which includes location information, hosting data, contact details, 4,439 currently live websites and an additional 14,061 domains that redirect to sites in this list. 5,869 sites that used this technology previouslyand 2,415 websites in the United States currently using Google Visualization Library.
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