Sylius

Sylius is an open-source ecommerce framework built on the Symfony PHP framework and API Platform. It is aimed at mid-market and enterprise brands that need a store tailored to specific business requirements rather than a fixed, one-size-fits-all platform.

A REST API drives headless and composable builds, powering custom storefronts and integrations across any device. The core ships the commerce essentials, including product catalog, cart, checkout, orders, and customers, and stays fully customizable through a plugin system, with extensions available on the Sylius Store marketplace and Packagist.

Sylius is completely free under the MIT License and self-hosted. A commercial Sylius Plus tier adds modular features such as OnePageCheckout, a B2B suite, multi-store management, partial order fulfillment, returns handling, loyalty, and multi-source inventory, along with SLA-backed support.