Online at no cost

• http://rubybestpractices.com/
• Ruby Best Practices
• Programming Ruby, 2000
• Rails 3.x and hackfest
• Rails 2.3.8
• http://www.humblelittlerubybook.com/
• https://github.com/barsoom/devbook
• http://ruby.bastardsbook.com/chapters/mechanize/
• http://xyzpub.com/en/ruby-on-rails/3.2/
• http://mislav.uniqpath.com/poignant-guide/
• http://web.archive.org/web/20090423015736/http://www.mockobjects.com/book/index.html
• http://www.ruby-doc.org/docs/ProgrammingRuby/
• http://openbook.galileocomputing.de/ruby_on_rails/
• http://www.sapphiresteel.com/The-Little-Book-Of-Ruby
• http://www.sapphiresteel.com/The-Book-Of-Ruby
• http://edwinmeyer.com/Integrated_RHG.html
• http://oreilly.com/openbook/
• MacRuby: The Definitive Guide
• Rails 3 in a Nutshell
• http://brixen.io/2012/12/11/a-ruby-design-process
• A little Ruby, A lot of Ojbects download A little Ruby, A lot of objects blog
• http://rubymotion-tutorials.com/
• http://www.rustforrubyists.com/book/index.html

Podcasts

• http://learn.thoughtbot.com/podcast/20

Guides

• http://guides.rubyonrails.org/
• http://ruby.railstutorial.org/book/ruby-on-rails-tutorial
• https://github.com/thoughtbot/guides
• https://github.com/barsoom/devbook

Paid Books

• Rails 4 in Action
• eloquent ruby
• the ruby programming language (pickaxe)
• agile web development with rails (pragprog)
• http://www.poodr.info/ with code https://github.com/skmetz/poodr

ebook only

• Multitenancy with Rails
• https://learn.thoughtbot.com/products/13 rubyscience
• http://clean-ruby.com/
• http://exceptionalruby.com/
• http://objectsonrails.com/
• http://devblog.avdi.org/2012/06/05/confident-ruby-beta/
• http://www.bigfatrails.com/
• http://rebuilding-rails.com/
• ruby guide matz http://www.rubyist.net/~slagell/ruby/
• https://tutorials.railsapps.org/plan/hobo https://tutorials.railsapps.org/plan/pro