SilverStripe is a Web Framework and Content Management System. It differs from many of the better known CMSes in that it uses fully object oriented code, has native Ajax support, and allows you to very cleanly customize the system to suit your needs.
- User friendly content authoring
- Object oriented PHP code-base
- Cross platform (MySQL, PostgreSQL, SQL Server, etc.)
Extremely extensible, great for developers and designers to be able to implement any design without being limited by usual 'block' like restraints