ProcessWire!

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.

django CMS is an Enterprise Content Management built with Django and one of the most active open-source projects in the Django ecosystem. Since 2007 it powers tens of thousands of sites large and small across the world, and benefits from a friendly and welcoming developer community.

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.

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.

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

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

CMS Made Simple - the open source content management system for the rest of us. CMS Made Simple helps experienced web developers and designers to create sites of power and beauty in a fraction of the normal time, avoiding hours of coding and allowing your clients to update their own sites with a minimum of fuss. From a simple brochure site to a complex portal, CMS Made Simple puts the power of a modular and extendable content management system at your fingertips. And best of all, its free!

Anchor is a lightweight blogging platform with a focus on simplicity and elegance.

Pimcore’s product is a portfolio focused on multi-domain master data management, omni-channel e-commerce and user experience management. The whole software platform composed of product information management (PIM), web content management (CMS), digital asset management (DAM) and e-commerce is dual-licensed and available under the free and open-source GPLv3 and a the proprietary PEL (Pimcore Enterprise) licenses. Pimcore is currently (May 2016) used more than 80.000 times in 174 different countries and has been translated to 18 different languages. »