VirtueMart is an open-source, free shopping cart plug-in designed to function with the Joomla! Content Management System (CMS). If you have installed this CMS on your server, then it is better to go with VirtueMart than any other third-party open source e-commerce solution. As VirtueMart is an add-on, Joomla must be installed for plugging-in VirtueMart. When compared to a full-blown eCommerce platform, VirtueMart is lightweight and optimal for low-to-medium traffic website.