Magento – Open Source eCommerce Platform
http://www.magentocommerce.com/

This is the start of an ambitious project that will change the way you do business online. Below are some of the reasons we think you’ll love Magento. As a professional open-source eCommerce solution, Magento allows the flexibility to create an online store that’s exactly what your business needs without extra clutter or constricting design limits. Never feel trapped in your eCommerce solution again. Whether your store grows overnight or over a year, don’t spend valuable time worrying about your solution not growing with you. With Magento, your site is completely scalable. This has been added to eCommerce Resources Subject Tracer™ Information Blog.