Zen Cart is an open source online store management system. It is PHP based, using a MySQL database and HTML components. Support is provided for several languages and currencies and it is freely available under the GNU General Public License.

Zen Cart branched from osCommerce as a separate project. Beyond some aesthetic changes, the major differences between the two systems come from Zen Cart’s architectural changes(e.g. a template system) and additional included features in the core. Among the modules already included are a Gift Certificate/Voucher module which allows to create, send and manage the digital coupons. A module to sell downloads(pdf or other media files) is included as well.

On December 20 2008 the Zen-Cart Team announced that the release of Zen-Cart version 1.4 would instead be released as Zen-Cart 2.0 due to major infrastructural changes.

This is a list of Open Source eCommerce Software.

* AgoraCart
* CubeCart
* IdeaCart
* Interchange (software)]
* Magento
* osCommerce
* TOUGHCartz – Version of osCommerce with 50+ usefull contributions TOUGHCartz Website
* OpenFreeway OpenFreeway Website
* OpenCart
* PrestaShop
* Satchmo (online store)
* StoreSprite
* Ubercart
* VirtueMart
* WP.osC
* Zeuscart
* Zen Car