good open source shopping cart systems

"AgoraCart is a powerful "Free" and Open Source online shopping cart & e-commerce system that offers a very wide range of "out-of-the-box" features that allows you to setup any solution from a simple template based store, if you are a novice or beginner, to the integration of a complex visual design concept containing all the magic a creative web designer can summon forth."

osCommerce is an Open Source based online shop e-commerce solution that is available for free under the GNU General Public License. It features a rich set of out-of-the-box online shopping cart functionality that allows store owners to setup, run, and maintain their online stores with minimum effort and with no costs, fees, or limitations involved.

osCommerce has attracted the largest community for an e-commerce solution that consists of over 106,300 store owners and developers worldwide with add-ons being contributed on a daily basis. To date there are over 3,500 add-ons available that have been created by the community to extend the features of an osCommerce online store.

osCommerce combines Open Source solutions to provide a free and open e-commerce platform, which includes the powerful PHP web scripting language and the fast MySQL database server. With no special requirements, osCommerce is able to run on any PHP 4.1+ enabled web server running on Linux, Solaris, BSD, Mac OS X, and Microsoft Windows environments.

With over 6 years of operation, osCommerce has built a showcase of over 10,200 online shops that have been voluntarily added to the live shops section, and powers many thousands of more online shops worldwide.