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

YiiFramework helps Web developers build complex applications and deliver them on-time. Yii comes with rich features: MVC, DAO/ActiveRecord, I18N/L10N, caching, authentication and role-based access control, scaffolding, testing, etc. It can reduce your development time significantly.

Laravel is a clean and classy framework for PHP web development. Freeing you from spaghetti code, Laravel helps you create wonderful applications using simple, expressive syntax. Development should be a creative experience that you enjoy, not something that is painful. Enjoy the fresh air.

Bootstrap Sleek, intuitive, and powerful front-end framework for faster and easier web development. Bootstrap was made to not only look and behave great in the latest desktop browsers (as well as IE7!), but in tablet and smartphone browsers via responsive CSS as well.

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.

Symfony is a PHP framework for web projects. Speed up the creation and maintenance of your PHP web applications. Replace the repetitive coding tasks by power, control and pleasure. Symfony is a PHP Framework, a Philosophy, and a Community - all working together in harmony.

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.

Smarty is a template engine for PHP, facilitating the separation of presentation (HTML/CSS) from application logic. This implies that PHP code is application logic, and is separated from the presentation.

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.

PRADO is a component-based and event-driven programming framework for developing Web applications in PHP 5. PRADO stands for PHP Rapid Application Development Object-oriented.

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.

WideImage is an object-oriented library for image manipulation. The library provides a simple way to loading, manipulating and saving images in the most common image formats.

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.