Ruby on Rails is an open-source web framework that is optimized for programmer happiness and sustainable productivity.
http://www.rubyonrails.org/
Frameworks
Get access to data on 3,655,736 websites that are Ruby on Rails Customers. We know of 2,109,240 live websites using Ruby on Rails and an additional 1,546,496 sites that used Ruby on Rails historically and 1,518,429 websites in the United States.
Get a list of 3,655,736 websites using Ruby on Rails which includes location information, hosting data, contact details, 2,109,240 currently live websites and an additional 1,579,431 domains that redirect to sites in this list. 1,546,496 sites that used this technology previously and 1,518,429 websites in the United States currently using Ruby on Rails.