Horus Framework
Smart Micro PHP Framework inspired by Sinatra in Ruby but not a clone
An OOP PHP micro-framework, a lightweight toolkit to help developers lay down the foundation of their PHP-based websites and applications
The Horus Framework is a pretty solid attempt at designing a good OOP framework in as a small package as possible.
Focused on a light codebase and on a solid, standards-friendly approach, Horus can be used to write advanced applications without having to deal with complex coding toolkits like Zend or CakePHP.
Horus is easy to learn and the code is pretty well commented in case developers need help figuring out what's going on.