Eventing is a PHP framework by Zander Baldwin based on the HMVC design pattern, licensed under the MIT/X11. At the core, the basic structure is similar to CodeIgniter (the early core libraries were inspired by Codeigniter's design), but the framework boasts features such as modules, namespaces, multiple URL suffixes, a moderately advanced theme templating system, etc. This project is now being managed under the Git Flow model.
The Eventing Framework, at this moment in time, is now the base for the LessHub project server-side framework, and required PHP version 5.3 or greater.
Enjoy!