Drupal: Drupal is a Content Management System and is written in PHP.
One of its key characteristics is that the entire framework of Drupal is OPEN SOURCE which means that its source code is available to everyone who is willing to work on it.
Zen Cart: Zen Cart truly is the art of e-commerce; free, user-friendly, open source shopping cart software. The ecommerce web site design program is being developed by a group of like-minded shop owners, programmers, designers, and consultants that think ecommerce web design could be and should be done differently.
Joomla: Joomla is an award-winning content management system (CMS), which enables you to build Web sites and powerful online applications. Many aspects, including its ease-of-use and extensibility, have made Joomla the most popular Web site software available. Best of all, Joomla is an open source solution that is freely available to everyone.
Magento: Magento is an open-source ecommerce web application launched on March 31, 2008. It was created by Varien, building on components of the Zend Framework.
CSS: What is CSS? CSS stands for Cascading Style Sheets, Styles define how to display HTML elements, Styles were added to HTML 4.0 to solve a problem, External Style Sheets...
osCommerce: osCommerce has attracted a large growing e-commerce community that consists of over 226,200 store owners and developers who support each other and extend osCommerce Online Merchant with add-ons being contributed on a daily basis.
PHP:PHP is a widely-used general-purpose scripting language that is especially suited
for Web development and can be embedded into HTML.