WooCommerce - A freely available eCommerce plugin that enables shop facilities on your WordPress website. Functionality enabling extensions & beautiful themes available.
VirtueMart - VirtueMart is an open source e-commerce solution designed as an extension of the Mambo or Joomla!
BigCommerce - BigCommerce provides ecommerce software solutions and shopping cart software for online businesses. Try it free and start selling your products online today!
Thirty Bees - Open e-commerce platform designed to work out of the box.
PrestaShop - Create your online store with PrestaShop's free shopping cart software. Build an ecommerce website for free and start selling online with hundreds of powerful features.
OpenCart - A free shopping cart system. OpenCart is an open source PHP-based online e-commerce solution.s