Algolia's Search API makes it possible to deliver a search experience in your apps & websites.
http://algolia.com
Widgets · Site Search
Get access to data on 624,393 websites that are Algolia Customers. We know of 392,437 live websites using Algolia and an additional 231,956 sites that used Algolia historically and 187,924 websites in the United States.
Algolia websites that are also using other technologies.
Get a list of 624,393 websites using Algolia which includes location information, hosting data, contact details, 392,437 currently live websites and an additional 822,509 domains that redirect to sites in this list. 231,956 sites that used this technology previously and 187,924 websites in the United States currently using Algolia.