This module provides a conventional interface for most common ajax operations in RubyOnRails projects. Plus it has underscored and ruby-like aliases for the core RightJS methods.
The plugin by itself is situated over here. It is available as a ruby-on-rails plugin and as a ruby-gem. There are also some documentation at the project’s wiki.
Generally this plugin is meant to be used with ruby-on-rails projects, but if you want to use it with different framework, you can download the plugin right here.
It also can embed this plugin right into the core at the custom builds page.