OpenCart

OpenCart is an open-source e-commerce builder, great for online store management, inventory administration and order processing. The platform itself is free, the users only have to pay for some of the add-ons and modules, and they have a marketplace with over 13000 available options to choose from. 
OpenCart has an intuitive interface with a simple to use dashboard and dedicated technical support. Its multi-currency feature, automated shipping calculator (taking into consideration weight and size), the discount coupon system, sales reports, and many other features, make the store owner’s tasks very simple to manage.