ExpressionEngine!

ProcessWire is a friendly and powerful open source CMS and CMF with an exceptionally strong foundation. With all custom fields, an easy-to-use jQuery-inspired API, and a powerful page selector engine, ProcessWire will rise to any task.

modx is a free, fast & flexible, ajax and seo content management systemMODx helps you take control of your online content. An Open Source Content Management Framework, it frees you to build sites exactly how you want and make them 100% yours. Zero restrictions and fast to build. Super-simple templates in HTML/CSS/JS (any lib you want). Registered user systems and a killer community. Welcome to web-building nirvana.

Many content management systems are focused on developer or site owner needs, but concrete5 is a CMS that truly delivers the best to both worlds. An in-context editing toolbar makes it easy to make changes as you navigate the live website. A truly MVC architecture and API make it easy for developers to truly use the CMS as building blocks.

ImpressPages is a PHP framework with admin panel. A new MVC engine is under the hood so you can customize ImpressPages in no time. Write your own plugins and themes to suit your and customers’ needs best. Both website layout and administration interface are user friendly and simply gorgeous.

Fork CMS is dedicated to creating a user friendly environment to build, monitor and update your website. We take great pride in being the Content Management System of choice for beginners and professionals.

Craft gives you the tools to sculpt a content management experienceprecisely tailored to your site’s needs.

Textpattern is an elegant content management system that is free, open source software. Web designers, developers, publishers and bloggers love its flexibility and extensibility. It has a powerful, sophisticated engine that can be infinitely tuned to suit whatever type of web site you can imagine.

Redaxscript is a modern, ultra lightweight and rocket fast Content Management System for SQLite, MySQL and PostgreSQL.

TYPO3 is an enterprise-class, open source CMS, used internationally to build and manage websites of all types, from small sites for non-profits to multilingual enterprise solutions for large corporations.