The Silva Content Management System
Silva is a powerful CMS for organizations that manage multiple or complex websites. Content is stored in clean and futureproof XML, independent of layout and presentation. Features include versioning, workflow system, visual editor, content reuse, sophisticated access control, multi-site management, extensive import/export facilities, fine-grained templating. Silva has an open source (new BSD) license.
Many large organizations and universities use Silva.
Have a look at the silvacms.org website for: