The Pith PHP Framework is a web application framework written in PHP 5. Features planned for 1.0 are listed in the Readme; the current version of the Pith Framework is 0.5.7.2 (alpha release 22)
The goal of the Pith Framework is to combine a simple to use (pithy) framework with an admin control panel.
The Pith Framework puts everything it does into an easy to use variable named $pith. (Currently there are a couple other vars in the global namespace but they'll be gone in a few versions...