Ohm is a free (open source) server manager, allowing Linux server configuration via an easy-to-use web interface. It aims to be an alternative to Plesk, cPanel and the like. DEVELOPMENT HAS BEEN MOVED TO GITHUB: http://github.com/Ohm-panel
Full featured but relatively lightweight web site management application for the Ruby on Rails framework. Includes easy to use CMS page, product/order and article management system as well other features.
Pakada takes new paths in creating and maintaining dynamic web content. It doesn't provide hardcoded modules, it let's you build them yourself within your browser, though it still ships with a handful of presets. Pakada is based on Ruby on Rails.