Heatmap and other tools for Google Maps.
https://developers.google.com/maps/documentation/javascript/visualization
Mapping
Get access to data on 10,299 websites that are Google Visualization Library Customers. We know of 4,364 live websites using Google Visualization Library and an additional 5,935 sites that used Google Visualization Library historically and 2,370 websites in the United States.
Get a list of 10,299 websites using Google Visualization Library which includes location information, hosting data, contact details, 4,364 currently live websites and an additional 13,680 domains that redirect to sites in this list. 5,935 sites that used this technology previouslyand 2,370 websites in the United States currently using Google Visualization Library.
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