A PHP framework for web artisans
The Symfony PHP framework
Open Source PHP Framework (originally from EllisLab)
Dependency Manager for PHP
Guzzle, an extensible PHP HTTP client
CakePHP: The Rapid Development Framework for PHP - Official Repository
PHP errors for cool kids
Laravel Debugbar (Integrates PHP Debug Bar)
PHP Image Manipulation
Free, open-source, self-hosted CMS platform based on the Laravel PHP Framework.
Goutte, a simple PHP Web Scraper
A tool to automatically fix PHP Coding Standards issues
A deployment tool written in PHP with support for popular frameworks out of the box
The most awesome validation engine ever created for PHP
A great looking and easy-to-use photo-management-system you can run on your server, to manage and share photos.