Cramp is a fully asynchronous realtime web application framework in Ruby. It is built on top of EventMachine and primarily designed for working with larger number of open connections and providing full-duplex bi-directional communication.
Add this line to your application's Gemfile:
gem 'cramp'
And then execute:
$ bundle
Manual installation:
$ gem install cramp
Please check out http://cramp.in to find out more.