Write real-time web applications with XMPP, PHP, and JavaScript
Caucho's QuercusTM is a reliable, 100% Java implementation of the PHP language allowing developers to use PHP flexibility for the web interface and Java for stability.
Chyrp is a blogging engine designed to be very lightweight while retaining functionality. It is driven by PHP and MySQL
CollectiveAccess is a highly configurable cataloguing tool and web-based application for museums, archives and digital collections.
An open source tool to generate a complete backend from a MySql database.