Chart.js for Rails Asset Pipeline
ActiveRecord extension that provides revision support so that history can be tracked and changes can be reverted. Emphasis for this plugin versus similar ones is including associations, saving on storage, and extensibility of the model.
The Australian energy use data inventory
Simple HTML5 Charts using the <canvas> tag
A tagging plugin for Rails applications that allows for custom tagging along dynamic contexts.
Audited (formerly acts_as_audited) is an ORM extension that logs all changes to your Rails models.