eZ Publish 4.0

eZ Publish is an Enterprise Content Management platform with an easy to use out of the box Web Content Management System. It is available as a free Open Source distribution and serves as the foundation for the rest of the eZ Publish Product Family.
Features:
Content model: eZ Publish is centered around a flexible and customizable content model. The content model enables you to define a content structure that is instantly available for publishing.
Website Interface: Editors browsing the front-end of the website have access to a content management toolbar, making it quick and easy to edit content. To start editing and adding content, you only need to know how to browse a website and how basic word processing functions work.
Administration Interface: The powerful back-end interface enables you to edit site content and settings.
Online Editor: The Online Editor is a WYSIWYG editor integrated into the website (no HTML coding required), providing formatting functions similar to word processing applications.
Web 2.0 features: User interaction and user-generated content is made easy with eZ Publish, enabling you to quickly build powerful, customized Web 2.0 websites. Tagging, blogs, forums and polls are all built-in eZ Publish features.
Content syndication: Content can be published in multiple formats, such as PDF, RSS, print, email.
E-commerce: The fully-featured Webshop enables you to sell products and services online, where customers can add products to a virtual shopping basket.
Search engine optimization: eZ Publish makes it easy for you to create content that will be effectively indexed by search engines. Sitemaps, friendly URLs, and easy management of key XHTML tags are all built-in features.
Scalability and performance: eZ Publish is cluster-ready and has a four-tier cache system, making it capable of running enterprise-size websites.