The Horde Application Framework is a general-purpose web application framework in PHP, providing classes for dealing with preferences, compression, browser detection, connection tracking, and MIME handling. Demo implementations frameworks are viewable...

A framework and distribution system for reusable PHP components. [Open source]

A lightweight open source web application framework that utilizes the MVC architecture to quickly develop web applications without having to adhere to strict templating and coding rules. [Open source]

An OO PHP framework with the core modules licensed under BSD.

An open-source enterprise PHP application platform. It is designed to be a mature platform for large-scale and high-volume web applications [MPL].

Implementation of Tal, Metal and I18N. Used to create pure XHTML templates in order to separate the user interface from business logic. [Open Source, LGPL]

Object-Oriented Framework for building web-based event-driven applications. It features tableless HTML, accesskey support, point&click app generator, auto data type recognition, UTF-8, i18n/l10n, PEAR integration [Open Source, GPL].

The core of the Midgard system. Also provides a CMS based on the framework. [Open Source, GPL]

An object oriented Web-application Framework, written in PHP. It is targeted at developers who wish to focus on business logic, instead of coding HTML. [Open source]

An open source PHP extension for providing and consuming web services in PHP. It has comprehensive support for security, addressing, binary attachments and WSDL generation. An API reference code coverage report and manual are also available on the web...