VirtueMart is an Open Source E-Commerce solution to be used together with a Content Management System (CMS) called Joomla! (and Mambo). Joomla! and VirtueMart are written in PHP and made easy for use in a PHP/MySQL environment.
Ubercart is an open source e-commerce 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.
Magento is a new kid on the block in the e-commerce 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.
