Open Source PHP Web Development Frameworks

Bedrock is a web framework designed around bridging popular APIs and technologies with PHP. While it has an MVC core with all the functionality expected from a web framework, it's primary goal is to simplify the use of other technologies with PHP.

A one file PHP 5.2.x web development framework built on the o.php libraries and using the JSON Template engine. The complete system weighs in at 50KB and gives you the tools to make simple sites quickly.

It is an open-source web application framework based on object-oriented PHP 5, MySQL, and XSLT. Designed following MVC architecture and REST principles.

A lightweight PHP Web application framework based on contextual stateful components.

Ismo is a web application framework that takes care of all the boring stuff and let's you focus on the fun and interesting parts!

Legato is above all a fast and lightweight, complete Web framework offering both server-side (PHP 5) and client-side (JavaScript) components to ease in the development and maintenance of today's demanding Web sites.

OpenSeeds is an open-source web-development framework and object model designed for the LAMP environment. It is designed with complex systems in mind. The framework itself is light-weight. The object model is simplistic.

Helma is a web application framework. It offers support for various scripting engines, but still the Rhino JS scripting engine plugin is the only bundled plugin. This project offers a PHP plugin, allowing PHP developers to make use of the Helma web appli

PMVCLite (abbreviation of PHP Model-View-Controller Lite) is a lightweight and powerfull generic object-oriented web application framework library

PHPOP, or POP for short, is an open source web application framework for fast and efficient scripting and serving of your websites and Internet applications.

The Pith PHP Framework is a web application framework written in PHP 5. Features planned for 1.0 are listed in the Readme; the current version of the Pith Framework is 0.5.7.2 (alpha release 22) The goal of the Pith Framework is to combine a simple to use (pithy) framework with an admin control panel. The Pith Framework puts everything it does into an easy to use variable named $pith. (Currently there are a couple other vars in the global namespace but they'll be gone in a few versions from now) Other objects can be loaded onto the $pith object, ex: $pith->filter, $pith->email, $pith->db

Sabai is a PHP web application framework based on the MVC pattern that allows development of web applications as sabai (which means comfortable or smooth in Thai) as possible.

SilverStripe is a Web Framework and Content Management System. It differs from many of the better known CMSes in that it uses fully object oriented code, has native Ajax support, and allows you to very cleanly customize the system to suit your needs.

Web Application Structure for PHP - A powerful multi-tier MVC web application framework built on Object Oriented PHP5. Uses PEAR DB_DataObjects and Html_Template_Flexy.

phpScheme is a web-application framework based on the MVC concept to quickly allow you to produce database driven applications without a lot of hassle. Database querying, editing, adding, and deleting is all taken care of for you.

solidMatter is a modular web application framework written in PHP. It focuses on an object-centric application design based on a modified, mostly JSR283-compliant JCR (Java Content Repository) as unified data storage with Web 2.0 capabilities.