Concrete CMS
Open Source Content Management System for teams.
Concrete CMS (formerly concrete5) is an Open Source Content Management System for teams. You can have the best of both worlds and run a secure website your content contributors will love using with Concrete CMS.
The user experience is built around in-context editing, it’s as easy to use as a word processor.
You'll spend less time training people, and less time having to fix things yourself. As an open source framework you can build complex applications as features like permissions, workflow...