osCommerce
osCommerce is an open source e-commerce shopping cart application. Initially released in 2000, osCommerce is one of the most used e-commerece applications with over 12,000 live stores.
osCommerce is an online shop e-commerce solution. Its feature-packed out-of-the-box installation allows store owners to setup, run, and maintain their online stores with minimum effort and with absolutely no costs or license fees involved.
-osCommerce developer