Angus is a REST-like API framework which fits perfectly with Ruby.
It is based on rack, so it can be used to complement an existing app or as standalone service to easily develop RESTful APIs.
It is a lightweight framework, with special focus on simplicity.
Angus is an excellent option for creating REST-like APIs
source 'http://rubygems.org' gem 'angus', '0.0.12’
~gem install angus