Ruby On Rails

Ruby On Rails is an open-source web framework that's optimized for programmers happiness and sustainable productivity. It lets you write beautiful code by favoring convention over configuration.
Site: http://rubyonrails.org

Books

Added Learn Ruby On Rails

Called 'the best book for beginners'

 Free book

Added Ruby On Rails Tutorial 3rd Edition

Learn Web Development with Rails

 Free book

Added APIs on Rails

The best way to build a REST API using Rails

 Free book