osCommerce, GPL

Open Source Online Shop E-Commerce Solutions: "osCommerce is an Open Source based online shop e-commerce solution that is available for free under the GNU General Public License. It features a rich set of out-of-the-box online shopping cart functionality that allows store owners to setup, run, and maintain their online stores with minimum effort and with no costs, fees, or limitations involved."

Multilingual customer relationship management (CRM) system for media organizations. GPL

Cream CRM 3.0.0 The application tracks sales orders, payments, shipments, services, online and print subscriptions, and the effectiveness of promotional campaigns through its easy-to-use reporting and analytical functions. Cream features a powerful module for communication with customers, including incoming and outgoing email, template-based HTML newsletters, and a WYSIWYG editor.