Zend framework is the open source, object-oriented web application framework wich is applied in PHP 5 and it is licensed under New BSD License. The applications of Zend Framework can run on any PHP stack which is able to fulfill the technical requirements.
Zend Technologies offers a PHP stack, Zend Server which helps in running Zend Framework Applications. Zend server offers improved performance for PHP and especially Zend Framework applications through application monitoring facilities.
Zend framework helps the developers to implement their own special variations of individual components without any need of hack into ZF codebase itself. Customizing Zend framework in this way helps you to create applications which are unique for your web development project.