Archangel is a Rails CMS

Aimbulance CMS

Paragon is a Jekyll Powered CMS currently in Development

Tiny CMS

Para CMS I18n admin module for models

Extends Trusty CMS Layouts to support nesting, sharing with Rails Controllers and rendering HAML

Extends Trusty CMS to allow page ordering

Podcasting extension for Refinery CMS

Ruby on Rails Retailers extension for Refinery CMS

A CMS generating static HTML by building blocks.

Ruby on Rails Members engine for Refinery CMS 2.0

Form generator for Refinery CMS v4.0 (rails generate refinery:form)