osPortal in an Open Source CMS/Portal system built with PHP5 and mySQL. osPortal is a template driven OOP application. The core consists of 5 modules: Membership, News, Forums, Template Engine and The application Framework.
dompdf - the PHP 5 HTML to PDF converter. dompdf is a (mostly) CSS compliant HTML rendering engine written in PHP. It supports external stylesheets, inline style tags, and the style attributes of individual HTML elements. Requires PHP 5.
A blogging engine with a 'keep it simple' philosophy. Designed to be fully buzzword compliant (AJAX, RSS, Web 2.0 - it's all there), logahead lets you effortlessly do what blogs were invented for:
Put your words on the web. Just blog.
scWiki -- Lightweight open source PHP collaborative wiki engine, with a customizable permissions system, categories, administration control panel, user groups and more.
The Open Log Engine is a powerful tool for advanced logging in games or programs. It easily allows you to make logging outputs in your program and analyse them afterwards with the Open Log Viewer, which provides you a powerful filtering system.
pyModeliXe is a Python template engine. Designers will appreciate its Dreamweaver support, and its XML compliant templates. Developers will be pleased about its plug-ins system, error management and the template cache.