WordPress is a state-of-the-art, semantic, personal publishing platform with a focus on aesthetics, Web standards, and usability. It was born out of a desire for an elegant, well-architected personal publishing system. While primarily geared towards functioning as a Weblog, WordPress is also a flexible CMS capable of managing many types of Web sites. In addition to the basic blog functions, it also has an integrated link manager, categories, tags, custom taxonomies, file attachments, XFN support, support for stand-alone pages, Atom and RSS feeds for both content and comments, blogging API support (Atom Publishing Protocol, Blogger, MetaWeblog, and Movable Type APIs), spam blocking features, advanced cruft-free URL generation, a flexible theme system, and an advanced plugin API.
SCMS is an MVC based secure content management system. It is designed from the ground up to withstand common Web application vulnerabilities such as SQL injection, XSS, CSRF, session fixation/hijacking, and many others. It is designed for PHP 5.0-5.2.x and MySQL 4.1+, and it can optionally support PostgreSQL as a database backend.
AldoContent is a lightweight CMS focused on usability and simplicity. It is designed for multilingual Web sites and can have sections with public and private content. It has file management, is extensible with plugins, and uses gettext for localization. Is written in PHP for a MySQL backend.
ContentRoller is an easy-to-configure, set up, customize, and use news, links, and blogging CMS environment that provides you the ability to have your own social news site like Digg, Yahoo Buzz, DZone, The Server Side, InfoQ, Slashdot, etc. ContentRoller can also be configured to look like a newspaper-based news site.
BEdita is a Web development framework that comes with a full-featured content management system out of the box. BEdita 3 is a solid software environment, fully compatible and respectful of Web standards. The user interface has been developed in accordance with well-established rules in usability and ergonomics, but it is also practical and enjoyable. BEdita has been built upon CakePHP, the well known framework, from which it inherits the MVC design pattern. Moreover, a number of third party libraries and tools have been used, like JQuery, Smarty, and so on.
nc-cms is a simple, fast, easy-to-use content management system (CMS). As you may know, these systems are traditionally very large, complex, and can take many weeks to integrate into a Web site. nc-cms can be integrated within an hour. It's great for managing a site with a set amount of pages.
EternalCMS is a content management system. It is built on top of Zend Framework, which helps promote cleaner code, better performance, and faster development. Some of its major features are the ability to post multi-page articles with unlimited categories and sub-category support, a bidirectional RESTful API, a user management system with multi-level ACLs and optional account activation, an optional moderation queue, RSS/Atom/MRSS feeds, and user profiles.