Highly scalable MVC framework for PHP. GPL

PHPulse 3.2.84 is extremely lightweight and fast, with a modular development environment that allows functionality to be added quickly and easily with a built in templating engine.

Interchange. GPL

freshmeat.net: "Interchange is an advanced e-commerce platform. It enables you to build completely customized and flexible online shops, while utilizing the knowledge gathered in more than a decade of active development. It offers high level e-commerce functions, support for PostgreSQL, MySQL, and Oracle, templating, a complete shopping cart functionality, payment processing, inventory, tax and shipping calculation, discounts, Web-based administration, localization, event routing, SOAP-based RPC, a custom tag language, and the full power of Perl."

Persistent storage framework. LGPL

"Midgard is a persistent storage framework. It provides an object-oriented and replicated environment for building data-intensive applications. It ships with a MidCOM content management system built on the Midgard framework. MidCOM's features include Web-based authoring WYSIWYG interfaces and a component interface for installing additional Web functionality. Midgard is built on the GNOME stack of libraries like GLib and libgda, and has language bindings for C, Python, and PHP. Communications between applications written in the different languages happen over D-Bus. The CMS runs on the LAMP (Linux, Apache, MySQL and PHP) platform."