Interesante

sistema de comercio en línea para los que deseen vender a través de internet. Esta solución desarrollada en código abierto nos permite de manera prácticamente gratuita, tener sitio para ventas en línea.

PrestaShop™ is a free, open-source e-Commerce solution that allows you to open your own Internet business in just a few clicks!

On the Web, you

provide your customers with a fun, personalized online store, to which you can add a variety of functions (“modules”) such as:

• Special deals (such as price reductions and giftcoupons)
• Payment with Paypal™
• New products
• Top sellers
• Text-message alerts for new orders and inventory levels

Sitio: http://www.prestashop.com/

Demo en línea: http://www.prestashop.com/demo.php