Pharo is an upcoming open source PHP programming framework that aims to streamline development of all websites, large and small, with a minimal learning curve.
This project is unrelated to the Pharo Smalltalk dialect.
At the core of the Pharo framework is a module loader with awareness of module and version dependencies and known conflicts. The system is being designed from the ground up to boast a completely hands-free update system inspired by Debian's APT package manager.
This project is still in early development, but stay tuned.
See the development site.