OpenCart – Open Source PHP-Based Online Shopping Cart System
http://www.opencart.com/

OpenCart is an open source PHP-based online shopping cart system. A robust e-commerce solution for Internet merchants with the ability to create their own online business and participate in e-commerce at a minimal cost. OpenCart is designed feature rich, easy to use, search engine friendly and with a visually appealing interface. This has been added to eCommerce Resources Subject Tracer™ Information Blog.