Refinery is a Ruby on Rails content management system for small business sites where the client needs to be able to update their Web site themselves without being bombarded with anything too complicated. It is truly aimed at the end user, making it easy for them to pick up and make changes themselves.
Jease is a Java-based CMS. Jease means "Java with Ease", so Jease promises to keep simple things simple and hard things (j)easy. It is easy to install: all you need is Java, and you are up and running in a minute. It has a user-friendly desktop-like interface with full AJAX support. It is easy to extend: develop your designs or content types with just a few lines of Java and HTML.
TomatoCMS is a powerful content management system. Its key feature is its Layout Editor and widget concepts. TomatoCMS also supports plugins/hooks, templates/skins, multiple languages, and has high performance. It supports a modular architecture with more than 10 built-in modules, such as ad, category, comment, menu, multimedia, news, poll, tag, and upload.
AlphaLemon CMS is a content management system built on top of the Symfony2 framework. It is designed to make it as easy as possibile to manage a Web site without requiring programming or a large learning curve, while giving developers a robust and flexible framework on which to build Web applications and distributable extensions.