OsCommerce is the most comprehensive and popular open source Shopping Cart system in existence. It has a huge list of features and is probably the most versatile shopping cart solution and offers vast range of customization choices for the on-line storefront owners depending on their need at a very affordable price.
osCommerce is an online shop e-commerce solution that offers a wide range of out-of-the-box features that allows online stores to be setup fairly quickly with ease, and is available for free as an Open Source based solution released under the GNU General Public License.
osCommerce is a complete online store solution that contains both a catalog frontend and an administration tool backend, which can be easily configured over web.
osCommerce is a PHP and mySQL based catalog and shopping cart application that can either be directly integrated into a web site - or - a site can be built around osCommerce as a base. Its feature packed out-of-the-box installation allows store owners to maintain their online stores with minimum effort and with absolutely no costs or license fees involved.