CMS built on symphony components, pimple, doctrine, guzzle, swiftmailer, etc. Includes ability to create themes, extensions and widgets to customize your sites. User permissions, responsive design, markdown editor and media manager.

Static site generators have become popular in recent years with ones like Hyde (python) and Jekyll/Octopress (Ruby). It's nice to see some static site generators built on PHP. There's actually 3 becoming popular; Sculpin, Phrozn and PieCrust. One thing I like about Sculpin is you can fire up a local php server and have it watch for file changes to auto update the site. It utilizes a lot of Symfony components. Also emphasis for easily packaging themes.

Bolt is a PHP CMS, built on the Silex framework with a number of Symfony components. It uses either SQLite, MySQL or PostgreSQL as a database. Twig for frontend with Bootstrap. CK Editor for WYSIWIG and CodeMirror for code editing.

Fork's been getting a lot of spotlight as alternative to WordPress' archaic programming principals. Fork recently released version 3.5 in which they have moved to be powered off Symfony components via Composer.

The guys over at FuelCMS have documented a method of integrating CodeIgniter and Wordpress into the same website. By doing so you can call the $CI super object from within your Wordpress theme files.

The initial problem we had with using Wordpress was wanting to incorporate CodeIgniter functionality into our Wordpress theme files. For example, we often have a header and footer that we include in many of our CodeIgniter view files. That same header and footer also needed to be included in the Wordpress theme. Our answer was to create a Wordpress include file that executes the CodeIgniter bootstrap within Wordpress.

"PyroCMS is a CMS built using the CodeIgniter PHP framework with modularity in mind. Lightweight, themeable and dynamic. This means it is perfect for CodeIgniter developers to use as a basis for your projects."