CodeIgniter is a powerful PHP framework with a very small footprint, built for PHP coders who need a simple and elegant toolkit to create full-featured web applications. If you're a developer who lives in the real world of shared hosting accounts and clients with deadlines, and if you're tired of ponderously large and thoroughly undocumented frameworks
Zend Framework is based on simplicity, object-oriented best practices, corporate friendly licensing, and a rigorously tested agile codebase. Zend Framework is focused on building more secure, reliable, and modern Web 2.0 applications and web services, and consuming widely available APIs from leading vendors like Google, Amazon, Yahoo!, Flickr, as well as API providers and cataloguers like StrikeIron and ProgrammableWeb.
CakePHP makes building web applications simpler, faster and require less code. CakePHP is a rapid development framework for PHP which uses commonly known design patterns like Active Record, Association Data Mapping, Front Controller and MVC. Our primary goal is to provide a structured framework that enables PHP users at all levels to rapidly develop robust web applications, without any loss to flexibility.
Kohana is an elegant HMVC PHP5 framework that provides a rich set of components for building web applications. It requires very little configuration, fully supports UTF-8 and i18n, and provides many of the tools that a developer needs within a highly flexible system. The integrated class auto-loading, cascading filesystem, highly consistent API, and easy integration with vendor libraries make it viable for any project, large or small.
Symfony aims to speed up the creation and maintenance of web applications, and to replace the repetitive coding tasks by power, control and pleasure. Symfony is aimed at building robust applications in an enterprise context. This means that you have full control over the configuration: from the directory structure to the foreign libraries, almost everything can be customized.
PHPDevShell as the name suggests provides a shell for your code to run in. PHPDevShell would typically be used to develop general web based applications or administration interfaces. PHPDevShell is essentially a ready made GUI application where you can immediately start with the development work that matters most, your application.
FuelPHP is a simple, flexible, community driven PHP 5.3+ framework, based on the best ideas of other frameworks, with a fresh start! FuelPHP is a MVC (Model-View-Controller) framework that was designed from the ground up to have full support for HMVC as part of its architecture. FuelPHP is extremely portable, works on almost any server and prides itself on clean syntax.
HTML Purifier is a standards-compliant HTML filter library written in PHP. HTML Purifier will not only remove all malicious code (better known as XSS) with a thoroughly audited, secure yet permissive whitelist, it will also make sure your documents are standards compliant, something only achievable with a comprehensive knowledge of W3C's specifications.
UIkit A lightweight and modular front-end framework for developing fast and powerful web interfaces. UIkit gives you a comprehensive collection of HTML, CSS, and JS components which is simple to use, easy to customize and extendable. UIkit is open source and MIT licensed. It is absolutely free of charge and you can use, copy, merge, publish and distribute the framework without any limitations.
Webasyst is a free PHP framework for creating sleek multi-user web apps and for building websites. Webasyst offers a multi-app UI ready for integrating and designing your app, handles user authorization, access rights management, routing setup, and much more. Great for creating web solutions for businesses and teams.
DIY is an open-source lightweight web application framework based on object-oriented PHP 5, MySQL, and XSLT. It is fully object-oriented and designed following the MVC architecture and REST design principles. The idea behind it is not to reinvent the wheel but instead to combine existing and proven technologies in a convenient and effective way.