Drupal Commerce is an open-source commerce module built on the Drupal CMS, released in 2008 and used by 60,000+ sites. It deeply integrates content management with commerce capabilities and supports B2B, multi-vendor marketplaces, and headless commerce.
CoreMedia is an enterprise digital experience platform (DXP) founded in Hamburg, Germany in 1996, focused on content-commerce integration with deep integrations with SAP Commerce and other mainstream e-commerce platforms, supporting hybrid traditional and headless architectures.