Reflex is a gem that allows you to connect your application to the React Social API

Rich-i18n is a module of E9s (http://github.com/archan937/e9s) which enriches I18n, Formtastic, the String and Symbol classes. This simplifies internationalization of your Rails application making a Rails developers life much easier.

Authlogic OAuth2 is an extension of the Authlogic library to add OAuth2 support. OAuth2 can be used to allow users to login with their Facebook credentials.

Rails UI Booster - More info @ https://github.com/lynnd335/rtrain

Simple SAAS through Authorize.net

Blog CMS for Rails 3

Authlogic extension/plugin that provides RPX (rpxnow.com) authentication support

Have a search motor built on the top of Solr, a highly customizable, scalable and well performing search engine. You are only few steps away from creating your own search motor.

Spud Admin Panel Engine

Spud Core Engine

Basis of my applications

Twice Baked Core Engine

zena is a Ruby on Rails CMS (content managment system) with a focus on usability, ease of customization and web 2.0 goodness (application like behaviour).