ProcessWire

ProcessWire is a free and open source PHP content management system and framework built to save you time and work the way you do. ProcessWire is designed to have an approachable simplicity that is retained regardless of scale. Simplicity often implies reduced capability, and this is not the case with ProcessWire. From the surface, there is very little complexity and the application requires no training. Check our demo: http://processwire.com/demo/