osCommerce is an online shop e-commerce solution that offers a wide range of out-of-the-box features that allows online stores to be setup fairly quickly with ease, and is available for free as an Open Source based solution.
Compatible with all major browsers.
Unlimited number of products and categories.
Automatic setup of e-commerce payment systems
Support for dynamic images.
Supports physical products
Web-based administration module.
Temporary and permanent shopping carts
Secure transactions with SSL support.
Real-time shipping quote integration with UPS, USPS.