Katyshop is an easy e-commerce solution written in PHP with MySQL. The code is object oriented with a very simple and clean architecture, making it easy for the programmer to work on customising the database or changing design.
Codename CookBook is a full-featured website solution. Not only does it provide a framework for creating new modules (or applications within the website), but it provides its own modules for handling everyday things like blogs and project management.
Splib is a PHP5-only library for use of XML-DOM objects, process and construct xhtml pages and parsing xml templates
Come with a framework (codename:tomates) for using in a MVC Solution; support templating, activerecord and a extensive forms widgets API