X-Cart is a template-based shopping cart software package with design, development & support processes certified under ISO 9001:2000 quality management system standard. It can be used both as a ready out-of-the-box shopping cart solution and a powerful shopping cart engine for a customized web shop.
X-Cart provides merchants with a wide range of tools allowing them to sell online without any programming skills. The list of features includes (but not limited to): SEO-friendly product catalog, inventory tracking, upselling and cross-selling tools, web-based administrative back-end, built-in integration with major shipping carriers and more than 100 payment gateways and payment systems (including certified integrations with Google Checkout, PayPal, Authorize.NET, UPS, USPS, DHL and many others).
Since X-Cart comes with open source code, it can be modified to meet unique needs of every merchant. Technical support is available 24x7. More information available on X-Cart official web site.