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SilverStripe CMS is a flexible open source multi-platform Content Management System and web framework for creating and managing rich websites through an intuitive web interface. it provide a web based administration panel that allow users to easily modified the each and every parts of the website.

it written in PHP5 and uses fully object orientated code, has native Ajax support, and allows you to very cleanly customize the system to suit your needs. The CMS generates clean markup code by using a custom template language and contains Sapphire – a custom object-oriented PHP5 web framework which specially designed to focus on your data and business logic, but now you can use Sapphire to build standalone applications or extend your SilverStripe CMS-powered site.
SilverStripe CMS is fully extensible through modules, widgets, themes, customization and Model Admin. it generally relies on a code customization model over configuration.
Features of SilverStripe
Simple. Intuitive and user-friendly Interface
Flexible, MVC framework
A modular, extensible web-application interface through modules, widgets, themes
Drag and drop tree-based navigation structure
WYSIWYG website editor for easily create and manage websites content.
Work-flow management
Data object model, database generation through [object-relational mapping], suite of customizable data input controls.
Fully XHTML Standards Compliant
Multiple templates per page
SEO friendly URLs
support for RSS feeds and Full text search
multilingual, multiplatform CMS
Highly configurable security/permissions model