The Styx PHP Framework is a highly modular, fast and flexible PHP Framework with a coherent API.

GitHub: http://github.com/zilenCe/styx/tree
Ohloh: https://www.ohloh.net/p/Styx

If you want to help and work on Styx feel free to fork the project on GitHub.

Styx is designed for the intermediate to advanced Web Developer with experience in PHP and other web technologies. Note: the current version (0.4a) is a pre-release and, as such, you may encounter bugs and incompatibilities. Report your findings: Contact-Info

There are documentation and guides to get started: Documentation & Guides