Underscore is a utility-belt library for JavaScript that provides functional programming support.
http://documentcloud.github.com/underscore/
JavaScript Libraries and Functions
Get access to data on 16,368,994 websites Underscore.js Customers. We know of 7,108,867 live websites using Underscore.js and an additional 9,260,127 sites that used Underscore.js historically and 945,158 websites in the United States.
Get a list of 16,368,994 websites using Underscore.js which includes location information, hosting data, contact details, 7,108,867 currently live websites and an additional 1,554,281 domains that redirect to sites in this list. 9,260,127 sites that used this technology previouslyand 945,158 websites in the United States currently using Underscore.js.
Countries
Financial
Group
Region