This application is a clone of Stackoverflow Clone written as an example code

Stack:

• Testing: integration tests, unit tests, tested by json, API, background jobs.
• Mailers gems: rspec. capybara, lurker, json spec, shoulda-matchers.
• Authorization: devise.
• Authentication: cancancan.
• Ajax: jquery, skim.
• Comet and Pub/Sub: private_pub.
• Authorization through social network (facebook, twitter): omniauth.
• Implemented: REST API for questions, answers, profile.
• Included: Nested Forms and polymorphic associations.
• Background jobs: sidekiq.
• Full-text search on Sphinx: thinking-sphinx.
• Deploy: Capistrano the server was configured, Ngnix, Passenger, and then Unicorn, Monit, backup.