CodeIgniter is an open-source PHP development framework for building dynamic websites. It is based on the MVC (Model-View-Controller) pattern and is known as one of the fastest PHP frameworks.
CodeIgniter
Install Fuel CMS on an Ubuntu 14.04 VPS with Nginx, PHP-FPM and MySQL
Fuel CMS is a lightweight, highly customizable CMS built with the very popular PHP framework CodeIgniter. You can create custom modules, views and controllers and use the CMS part only when you need it. It is a hybrid of a framework and a CMS.