Octopus_sinatra is a project mainly written in Ruby, it's free.
Octopus + Sinatra Example
This is a sample application using octopus + sinatra. This app demonstrate the basics of octopus running outside Rails. starting the application, the user will select what shard they want to see information.
git clone git://github.com/tchandy/octopus_sinatra.git cd octopus_sinatra bundle install rake db:migrate rackup
This project is sponsored by the Ruby Summer of Code, and my mentors Mike Perham and Amit Agarwal.
Copyright (c) 2010 Thiago Pradi, released under the MIT license.