In Russia, shopping cart buys YOU!

A full blown Accounting, ERP, CRM and Ecommerce platform, built in .NET. Interprise uses a variation of http://www.aspdotnetstorefront.com/ as its ecommerce frontend.

Actinic Catalog is desktop software that allows you to edit your store offline, providing a unique way to manage your online presence. http://www.actinic.co.uk/

CubeCart is a free-to-use, is not Open Source software, full source code is available at no cost. The licensing model allows for customisation of the code. http://www.cubecart.com/

EROL is another Offline Cart. http://www.erol.co.uk/

Interspire creates shopping cart, email marketing, e-commerce, content management and knowledge management software used by over 20000 companies worldwide. http://www.interspire.com/

Magento is the eCommerce software platform for growth that promises to revolutionize the industry. http://www.magentocommerce.com/

osCommerce has over 218,300 store owners and developers. Add-ons are contributed on a daily basis. There are over 5,600 add-ons available for free. http://www.oscommerce.com/

X-Cart is template based software with open source code. This means you can modify the look & feel and functionality of the shopping cart the way you need should you require any business specific features. http://www.x-cart.com

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 and additional included features in the core. Among the modules already included are a Gift Certificate/Voucher module http://www.zen-cart.com/