Ruby on Rails is a great web application framework written in Ruby. It is very extensible, and there are two common ways to write add-ons exists: plugins and gems. On this page you can find all plugins for Ruby on Rails that I have developed during my programming practice. Also take a look at my GitHub public profile to check things that I have published but not described here yet.
The Sphinx Client API interacts with searchd daemon to retrieve search results from Sphinx Search Engine, which used in large applications with a lot of data to provide fast, reliable search engine. Ruby API is a port of PHP API, and included in Sphinx distributive since version 0.9.8. It is 100% tested with RSpec testing framework and used in production on many really big sites.
This is Search Engine Optimization (SEO) plugin for Ruby on Rails applications. It towards a unified approach to generating page title, description, keywords based on rules of building search friendly pages and thus simplifies your applications on all levels (models, controllers, views).