WooCommerce is an open-source ecommerce platform powered by WordPress, enabling merchants and developers to build fully customizable online stores.

CS-Cart is a fast, flexible, and scalable eCommerce platform for launching on-premises or cloud multi-vendor marketplaces and online stores for B2B/B2C.

Bagisto is the best open source eCommerce platform for building marketplaces and is used by businesses looking to enhance their online presence.