Prototype is a javascript framework which aims to ease development of dynamic web applications.
http://www.prototypejs.org
JavaScript Libraries and Functions · JavaScript Library
Get access to data on 2,689,689 websites that are Prototype Customers. We know of 797,203 live websites using Prototype and an additional 1,892,486 sites that used Prototype historically and 298,871 websites in the United States.
Get a list of 2,689,689 websites using Prototype which includes location information, hosting data, contact details, 1,630,095 currently live websites which includes 832,892 domains that redirect to sites in the list. 1,892,486 sites that used this technology previously and 298,871 websites in the United States currently using Prototype.