PrestaShop is a free e-commerce package that was launched in 2007 but has gained a lot of market due its utility and usability. Considered better than traditional scripts such as osCommerce or OpenCart, it is used now by more than 100.000 stores.
Entire script is written in PHP based on Smarty framework. Developer site contains demo to front end and to back end (admin) areas where future store owners can test its capabilities.
With PrestaShop is easier to manage the catalog of products, to import lists with items and price updates. Includes different modules for shipping, payments, translations, SEO, marketing and taxes.
Offers a large number of add-ons that may enhance or personalize your online store, some of them are paid.
Is easy to install it, to setup and customize a shopping cart with all modern features included, in minutes.