Framework written in PHP

https://www.horde.org/apps/horde

https://sourceforge.net/projects/cep/

http://codeigniter.com/

CodeIgniter is a powerful PHP framework with a very small footprint, built for developers who need a simple and elegant toolkit to create full-featured web applications.

https://cakephp.org/

http://amb.sourceforge.net/

Ambivalence is a Model-View-Controller framework for PHP web development. Based on the Java-based Maverick project, Ambivalence also offers clean MVC separation and an XML sitemap