PHP

Admidio By: Admidio
Free GNU GPLv2

Admidio is a free open source user management system for websites of organizations and groups. The system has a flexible role model. The system contains several modules such as member lists, event manager, guestbook, photo album and download area.

Silex By: Fabien Potencier
Free MIT

Silex is a PHP microframework featuring an intuitive and concise API, an extension system, a service container, a services type provider, a controller type provider, and more.

LiteCart By: T. Almroth
Free MIT

An e-commerce platform built with PHP, jQuery and HTML5. No junk, minimal code, and almost no third party components. Easy to install, extremely easy to use and easy to modify.

phpMussel By: Caleb Mazalevskis
Free GNU GPLv2

phpMussel is a PHP script designed to detect trojans, viruses, malware and other threats within files uploaded to your system wherever the script is hooked, based on the signatures of ClamAV and others. Works for any system with PHP+PCRE installed.

HTML Purifier By: Edward Z. Yang
Free Open Source LGPLv2.1

A standards compliant HTML filter library written in PHP. HTML Purifier will not only remove all malicious code (XSS) with a thoroughly audited, secure yet permissive whitelist, but it will also make sure your documents are standards compliant.

Composer is a tool for dependency management in PHP. It allows you to declare the libraries your project depends on and it will manage (install/update) them for you.

Elgg By: Elgg Foundation
Free Open source GPL2/MIT

Elgg is an award-winning open source social networking engine that provides a robust framework on which to build all kinds of social environments.

phpass By: Openwall
Free

A portable public domain password hashing framework for use in PHP applications.

CalendR By: Yohan Giarelli
Free MIT

CalendR is an object oriented Calendar management library on top of PHP5.3+ Date objects. Use it to deal with all your needs for calendars and events.

TweetPHP By: Jonathan Nicol
Free MIT

A PHP class for querying the Twitter API and rendering tweets as an HTML list.

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