Configus helps you easily manage environment specific settings
Yet Another Acl
This gem provides additional scopes for your ActiveRecord models.
Handle pub/sub messaging through private channels in Rails using Faye.
Ruby on Rails plugin. Fishes out the Accept-Language header into an array.
Gem that provides api for unisender.com.ua
A simple(r) auditing / version tracking library for Rails (ActiveRecord). Developed and tested for Rails 3.2 onwards. Should work with earlier Rails 3 versions but no guarantee. Should be easy to tweak it though.
timepad api gateway
Decorators/View-Models for Rails Applications
Organise ActiveRecord model into a tree structure