“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…”