The purpose is to provide a lightweight, and modular middleware which doesn't constrain the developer to a specific game style, like SDL.
You can get the source code of Gamalto from GitHub: http://bit.ly/KpozS2
Play Rick Dangerous from the web: http://bit.ly/IF3f8y
(source code: http://bit.ly/LmABea
Check the official website and documentation: http://bit.ly/AduqWh