To sort the instance of ActiveRecord::Relation by Redis
Draw flow-chart by Workflow lazily
A fullscreen, hardware accelerated slider for jQuery.
Ruby Api for WeiXin
A Rails engine to provide the ability to add documentation to a Rails application
Like acts as state machine (aasm), but _way_ better (it's in Ruby too!)
fastdfs client for ruby
Spree is a complete open source e-commerce solution for Ruby on Rails.
Do some browser detection with Ruby. Includes ActionController integration.