PHP Bayesian Filter- Do your own adaptive Bayesian analysis of text. I didn’t write it, but I did translate it and hope to build on it. However, it is fully baked as is and includes the class as well as an example script to show you how to use it.

PHUI - PHP HTA User Interface toolkit. Build stand alone web applications that don’t require a web server.
Phunami - Protect your dynamic PHP scripts from getting Slashdotted.

PHPGeek Utilities - A group of small scripts that make PHP development easier.