"Open source Web site content management systems (CMS) don't provide a full solution for the needs of many Web site administrators because they lacked a shopping cart. But thanks to projects like Drupal's E-Commerce shopping cart and Mambo's mambo-phpShop, things are getting easier: The shopping carts integrate directly into the core of the system, providing an acceptable shopping experience without requiring multiple logins, and they keep the theme of the Web site intact.
"Drupal's shopping cart module is called E-Commerce. Its features include selling not only physical products but also file downloads, as well as running auctions with an extra auction module installed..."
