SilverStripe

"SilverStripe is a robust and flexible website content management system (CMS) tightly integrated with an application framework. It is open source and embraces modern system architecture and agile development methodologies. The award-winning PHP5/MySQL-based system saves not only time and nerves for technical users, but also features a straightforward interface that non-technical content authors will find a joy to use. This book will help you learn the CMS system, develop a custom application and helps you to use SilverStripe professionally." --Publisher's description.