N2F Yverdon is the PHP flavor of the N2 Framework. Built for PHP 5.1+ it is a minimalistic tool belt that aids in the creation of custom websites.
We're in the process of rebooting a few things with the project, documentation will begin appearing in the next few months at a new URL.
The project is currently stable and usable for production, but will potentially undergo a set of breaking changes after an upcoming code review. These are mostly organizational changes to prepare for v1.0.