Doo is a PHP framework designed to give you a delightful development experience without slowing down you applications like most frameworks does.

Doo tries to be as lightweight as possible and has a small source code footprint. The creator actually benchmarked various possible approaches when building a module and chooses the fastest for Doo.

Doo is easy to learn and use. You only need to know PHP and object-oriented programming. You are not forced to learn a new configuration or templating language.

Source: DooPHP