osCommerce - www.oscommerce.com Versions: osCommerce 2.2 MS2, osCommerce 2.2, osCommerce 2.2 RC2 osCommerce is an open source online shop e-commerce solution that is available for free. 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.

osCommerce advantages:
+ Free
+ Multi-language support
+ Support for downloadable egoods
+ Real time shipping rates calculation (UPS, USPS, FedEx)
+ Order status system, automated and manual credit card processing
+ Encrypted customer data, secure transactions with SSL

osCommerce disadvantages:
- No authorized technical support service available. Only forums and online articles
- Partially editable interface, plain text editor
- Only featured products available as marketing and promotion tools
- Complete database backup only
- Poor choice of statistics tools (statistics for product sales, low stock)