Dependency Manager for PHP

:cloud: ownCloud web server core (Files, DAV, etc.)

Community-based GPL-licensed network monitoring system

Guzzle, an extensible PHP HTTP client

MyBB is a free and open source forum software.

CakePHP: The Rapid Development Framework for PHP - Official Repository

Kanban project management software

A free, self-hostable aggregator…

The missing Symfony Admin Generator

An open source eCommerce plugin for WordPress.

Official repository for concrete5 development

A @laravel based RAD platform for back-office applications, admin/user panels, and dashboards.

MODX Revolution - Content Management Framework

Better Markdown Parser in PHP

Open Source PHP Framework (originally from EllisLab)

Propel2 is an open-source high-performance Object-Relational Mapping (ORM) for modern PHP

The Symfony PHP framework

The Symfony documentation

CiviCRM (Core Application and Framework)

Yii 2: The Fast, Secure and Professional PHP Framework