Opencart

OpenCart is an open-source e-commerce platform that enables businesses to build and manage their own online shops with relatively low entry costs, hosted on their own server or a hosting environment.

Key features include support for multiple payment and shipping methods, multi-store, multi-currency, and multi-language capabilities, plus a large ecosystem of extensions and themes (10 000+ modules).

It is especially suited for small-to-medium sized businesses that want flexibility and control over their online commerce solution.