Zen Cart is an online store management system. Zen Cart is an open source, PHP/MySQL based Ecommerce shopping cart solution. It’s free and the source code is completely customizable by anyone who wants to modify or develop it. As far as open source software goes, Zen Cart is a giant. Even though it’s free, it gives some commercial carts a run for their money in terms of services offered. Zen Cart branched from osCommerce as a separate project in 2003. Beyond some aesthetic changes, the major differences between the two systems come from Zen Cart’s architectural changes (for example, a template system) and additional included features in the core. The release of the 1.3.x series further differentiated Zen Cart by moving the template system from its historic tables-based layout approach to one that is largely CSS-based.