OpenCart - A free shopping cart system. OpenCart is an open source PHP-based online e-commerce solution.s
Novocall - Novocall converts web visitors into sales calls in seconds.
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.
OptinMonster - OptinMonster helps to convert abandoning website visitors into subscribers and customers.
WooCommerce - A freely available eCommerce plugin that enables shop facilities on your WordPress website. Functionality enabling extensions & beautiful themes available.
Callpage - Turn website visitors into sales calls. Use CallPage and provide immediate free phone callback to your leads in 28 seconds.