Open source content management platforms

Drupal

Drupal is a free software package that allows an individual, a community of users, or an enterprise to easily publish, manage and organize a wide variety of content on a website. Hundreds of thousands of people and organizations are using Drupal to power an endless variety of web sites, including

* Community web portals
* Discussion sites
* Corporate web sites
* Intranet applications
* Personal web sites or blogs
* Aficionado sites
* E-commerce applications
* Resource directories
* Social Networking sites

Joomla

Joomla is an award-winning content management system (CMS), which enables you to build web sites and powerful online applications. Many aspects, including its ease-of-use and extensibility, have made Joomla the most popular web site software available. Best of all, Joomla is an open source solution that is freely available to everyone.

Wordpress

WordPress is a state-of-the-art publishing platform with a focus on aesthetics, web standards, and usability. WordPress is both free and priceless at the same time.

Texp Pattern

Textpattern is a free open source content management system unlike any other; it allows you to easily create, edit and publish content and make it beautiful in a professional, standards-compliant manner

ExpressionEngine

 is an interested hybrid of commercial and open-source software. The base code for the ExpressionEngine core is built on CodeIgniter, which is their own open-source PHP framework. But the commercial aspect of the CMS means that there’s committed developers and technical support people focused solely on EE. Cost is high, especially for commercial sites

Contao

Contao is an open source content management system (CMS) for people who want a professional internet presence that is easy to maintain. The state-of-the-art structure of the system offers a high security standard and allows you to develop search engine friendly websites that are also accessible for people with disabilities. Furthermore, the system can be expanded flexibly and inexpensively. Easy management of user rights, the Live Update Service, the modern CSS framework and many already integrated modules (news, calendar, forms, etc.) have quickly made Contao one of the most popular open source content management systems on the market.

Silver strips

The SilverStripe CMS is an open source web content management system used by governments, businesses, and non-profit organisations around the world

Umbraco

Umbraco has been designed to make you as productive as possible. This means it's fast, beautiful and easy to use so you can focus on getting your message

Concrete5 

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

Radiant

Radiant is built using Ruby on Rails.
Radiant CMS uses a simple admin interface which features three major parts, pages, snippets and layouts. Through these three components you’ll be able to edit pages to fit your needs. Radiant has an intuitive flexible site structure which organizes each section according to importance and by folders. You can use HTML or markdown in any part of your site, like the content pages or your sidebar. Radiant’s layouts generally contain most of the HTML for a pages design.

eZ Publish

eZ Publish is an Open Source Content Management System and Platform with Digital Marketing and e-Commerce capabilities

VIVVO 
is news Content Management System atop a powerful framework, empowering thousands of industry leading online newspapers, magazines, portals and medai  publishers

Squarespace

is the easiest way for anyone to create an exceptional website. Pages, galleries, blogs, e-commerce, domains, hosting, analytics, 24/7 support

CushyCMS 
is a FREE hosted content management system that's actually easy to use, fast to setup and doesn't require programming skills

Fission

The Fission Web System gives you control of your website with powerful content management tools and custom add-ons that are built with small business in mind.