Bootstrap is the HTML, CSS and JS framework. It is open source front end framework and used for web development. Bootstrap's code contains two popular CSS preprocessors, Less and Sass. Initial release: 19 August 2011
Zend Framework (ZF) is an open source, server side, object-oriented web application framework implemented in PHP 5.6+ ZF can be used to develop web applications and services. It provides object-oriented code using a broad spectrum of language features.