The Silva Content Management System
Silva is a powerful CMS for organizations that manage large and complex websites, with optional farms of sub-websites. Content is stored appart from the layout and presentation, providing the possibility to present it under different visual forms and medias. Features include versioning, workflow system, visual editor, content reuse, sophisticated access control, multi-site management, extensive import/export facilities, customization of layouts and presentation. In addition Silva can be extended by a number of extensions and provides an API for you in order to create new ones. Silva has an open source (new BSD) license.
Have a look at the silvacms.org website for: