osCommerce is an online shop e-commerce solution under on going development by the open source community. 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 combines open source solutions to provide a free and open e-commerce platform, which includes the powerful PHP web scripting language, the stable Apache web server, and the fast MySQL database server. It also comes with a variety of modules and support of almost every payment gateway. A big developers community is ready to offer custom solutions depending on your needs.