PrestaShop is professional open source eCommerce shopping cart software. Pretty new comer, it is competing against Magento in the full-featured open source ecommerce suite.
Magento is a new kid on the block in the open source ecommerce field. It is providing many of the features you are waiting from a modem e-commerce platform: tagging, voting, social networking, SEO compliancy.... A Must See solution.
High performance customizable shopping cart system. Designed for most kinds of ecommerce websites. Optimized for smooth run with up to 20,000 products.
Ubercart is an open source ecommerce package that fully integrates an online store with Drupal, the leading open source content management system. This is a great combination for anyone looking to build a community around a product, sell access to premium content or offer paid file downloads.
