The Symfony PHP framework

Open Source PHP Framework (originally from EllisLab)

Effective June 1, 2021: Phabricator is no longer actively maintained.

CakePHP: The Rapid Development Framework for PHP - Official Repository

Phan is a static analyzer for PHP. Phan prefers to avoid false-positives and attempts to prove incorrectness rather than correctness.

Documentation Generator for PHP

The most popular PHP library for use with the Twitter OAuth REST API.

Xdebug — Step Debugger and Debugging Aid for PHP

li₃ is the fast, flexible and most RAD development framework for PHP

PHing Is Not GNU make; it's a PHP project build system or build tool based on Apache Ant.

NOT MAINTAINED - Development moved to github.com/KnpLabs/php-github-api

Data Access Library to access a CouchDB server with PHP.

PHP interface to Stanford NLP tools (POS Tagger, NER, Parser)

Losslessly compresses images in your Amazon S3 buckets on-the-fly.

Cassandra PHP-based client library for managing and querying your Cassandra cluster

Web Application (still alpha!) using Gearman, Jailkit and SilverStripe CMS

A PHP wrapper around Yahoo!'s Smush.it image compressing web service.

OpenEvSys is free open source software designed for use by organisations who need a software tool to manage information on human rights violations

Weasel is an object marshalling library for PHP supporting JSON and XML.

PHP consumer for the DocRaptor.com API

Fixtures for the Lithium framework.

Awesome formatter for PhpSpec

Phing task to run lithium tests.

Autosmush but local

PHP consumer for the DocRaptor.com API

Back up script.

s3 with SQL + nextgen gallery modded version