A free CDN (Content Delivery Network) where Javascript developers can host their files.
http://www.jsdelivr.com/
Content Delivery Network
Get access to data on 6,106,652 websites that are jsDelivr Customers. We know of 2,534,689 live websites using jsDelivr and an additional 3,571,963 sites that used jsDelivr historically and 1,344,027 websites in the United States.
Get a list of 6,106,652 websites using jsDelivr which includes location information, hosting data, contact details, 2,534,689 currently live websites and an additional 5,307,832 domains that redirect to sites in this list. 3,571,963 sites that used this technology previously and 1,344,027 websites in the United States currently using jsDelivr.