Projects
LightVC
LightVC is a lightweight model-view-controller (MVC) framework without the model. It is comparable to, although unlike, CakePHP, Code Igniter, symfony, Solar, and Zend Framework to name a few. Its major difference is that it does not try to be a full "Web framework" and instead solves the need for an MVC that is not coupled to a bunch of other stuff.
CoughPHP
Cough is an extremely lightweight PHP5 ORM framework for dealing with objects that have single table counterparts in a database. It is easy to install, generates 80% of the model code you'll need, and is highly extensible.
PHP Autoloader
This is a class for PHP that keeps the user from having to manually include classes by automatically including them on-the-fly as needed.
SimpleReflector for PHP
An easy-to-use PHP reflection class for exposing an object's identity so problems can be debugged quickly.
Markdown Extra GeSHi Converter
Convert Markdown, Markdown Extra, and GeSHi code blocks to HTML, or add Markdown Extra + GeSHi support to existing apps such as TextMate and MediaWiki.
jQuery Live Filter Plugin
Meant to replace the other Live Filter projects I've encountered by providing speed, ease-of-use, and a useful feature set.