Zend Framework
The Zend Framework is also considered as a component library because of its collection of loosely coupled components that developers can make use of independently, more or less.
It also provides a model-view-controller (MVC) framework that can be used as the basis for an application structure for applications created with it. As an object-oriented framework, it provides reusable and extensible code that can be shared among different applications, which allows them to scale easily to the enterprise level.