Shopware

Shopware is a growing, modern open-source platform with strong roots in the DACH region (Germany, Austria, Switzerland). It offers a flexible, rule-based system for promotions and shopping experiences, and a strong focus on B2B features. The platform is developer-friendly with a modern tech stack and robust APIs for headless commerce. It comes in a free Community Edition and paid cloud/enterprise versions.

While its global community and app ecosystem are smaller than giants like Shopify, it's a compelling choice for mid-market businesses in Europe seeking a customizable, feature-rich alternative to larger SaaS platforms, with a clear path from SMB to enterprise.