Concrete5
Concrete5 lets content creators edit their websites easily without the need to access a central administration interface. A wide variety of content types are supporting through Concrete's block's infrastructure, which makes it easy for developers to extend the system for their clients. A unique and attractive UI makes it so that Concrete5 will appeal to technical and non-technical users alike, and makes picking up the system easy. Beyond this attractive interface lies a powerful framework, a flexible and secure permissions model, and a great platform for PHP-based web applications.