PrestaShop is an e-commerce solution which is both free and open source. It is available under the Open Software License and officially launched in August 2007 for small to medium-sized businesses. The software, which is based on the Smarty template engine, has approximately 24,000 active stores as of August 2009.

Compared to other open source e-commerce solutions it gives your store a nice and fast web 2.0 presentation. Coding extra functionality can be a tricky, since it requires knowledge about Smarty and most available modules are not open source.