osCommerce Online Merchant is a complete self-hosted online store solution that contains both a catalog frontend and an administration tool backend which can be easily installed and configured through a web-based installation procedure. It is an Open Source 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 online stores with minimum effort and with no costs, fees, or limitations involved. Also there are hundreds of add-ons that are available for free to customize osCommerce Online Merchant online stores.