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.