The legal case management (LCM) system is a software aimed for use by not-for-profit legal advice centres in order to make better follow-ups of their work, including client consultations and court events, as well as more efficient reporting.

Sahana is a Free and Open Source Disaster Management system. It is a web based collaboration tool that addresses the common coordination problems during a disaster from finding missing people, managing aid, managing volunteers, tracking camps effectively between Government groups, the civil society (NGOs) and the victims themselves.

Social media script: PHP, MySQL(InnoDB), Smarty (+ClipCache), AJAX (JsHttpRequest), Memcached (DklabCache), jQuery, GeShi, Jevix. Not sure what this actually is maybe someone can help translate in comments.

phpFood is a Php & Mysql & Ajax, online food ordering project.

AJAX Chat is a fully customizable web chat implemented in javascript, PHP and MySQL which integrates nicely with common forum systems like phpBB...

Intergrate Flickr, Twitter, Facebook, YouTube, Google Shared Items, Tumblr, Digg, Reddit, LastFM, Stumbleupon, Delicious, Upcoming, Mixx & more in to one

Pubwich is an open-source PHP Web application created by Rémi Prévost that allows you to aggregate your published data from multiple Websites and services into a single HTML page.

Simple way to manage your personal todo list in AJAX-style. Written in PHP 5 and jQuery UI. Data stored in SQLite or MySQL database.

Tiny Tiny RSS is a web-based news feed (RSS/Atom) aggregator, designed to allow you to read news from any location, while feeling as close to a real desktop application as possible.

Provides a dynamic view of popular baby name statistics from around the world using Google Maps.

SimplePie is written in PHP, that puts the 'simple' back into 'really simple syndication'. Flexible enough to suit beginners and veterans alike, SimplePie is focused on speed, ease of use, compatibility and standards compliance.

BilboPlanet is an Open Source RSS feed aggregator written in PHP.