277-mountable-engines is a project mainly written in RUBY and JAVASCRIPT, it's free.
RailsCasts Episode #277 Mountable Engines
RailsCasts Episode #277 Mountable Engines
http://railscasts.com/episodes/277-mountable-engines
Commands used in episode
rails -v rails plugin new uhoh --mountable rails g controller failures index rails g model failure message:text rake db:migrate rake uhoh:install:migrations cd test/dummy rails g controller simulate failure