The OPML Editor is a very simple PHP/AJAX web application to edit outlines stored as OPML. It has not much functionality but can be quite useful for a starting point for implementing an outliner

SimplyBibTeX main screen

SimplyBibTeX is a PHP web application to render BibTeX bibliographies in different representations. Your coworkers can subscribe to RSS and Atom feeds and get notified if something changes in the particular database. It supports unlimited databases, stores metadata and is using an internal templating mechanism to change the user interface.

temx is a PHP based content management system (CMS) or website construction kit utilising the principle of pipelines and filters commonly used in multimedia frameworks like DirectX or GStreamer. Don't be scared, it sounds very technical but actually its simple, believe me!

Rendering Pipeline