OpenCart is a highly customizable open source
ecommerce platform with no monthly fees.
It has a robust administrator dashboard that gives you an at-a-glance view of important metrics like sales, customers, and more.
OpenCart also has multi-store support that lets you stay on top of different stores from a single interface. This functionality lets you set products for different stores, use specific themes for each online store, and localise your websites. Product options and attributes are also quite flexible with OpenCart, and the solution lets you add extra product variables.
And just like most ecommerce platforms, OpenCart is highly customizable and extendable. It has more 13,00 modules and themes that you can use to truly make your site your own.