Free Open Source Shopping Cart Solution – eCart Commerce
eCart is a new open source e-commerce shopping cart solution that built with PHP and MySQL. It’s a powerful shopping cart application that allows you to manage multiple stores from one single admin panel with AJAX user interface supported. And unlimited product categories, one-page-checkout, SEO friendly URL features are also supported. eCart Ecommerce has a powerful admin panel with a dashboard that enables you to have quick look for the most important data like orders and popular products. eCart is a social shopping cart that allows customers access to FaceBook, Twitter and other Social Network sites. Customers will have the ability to write reviews and complete summaries about the products they have purchased, including attaching images or videos to upload to Fickr or YouTube. Moreover, you can create customer groups, define different tax information for different zones or products and generate content within the store with the CMS features. Cart is currently in beta status and you can download eCart 0.6 or see the live demo right here.
Helpful info. What about TomatoCart? It is awesome too.