An open-source (MIT) headless commerce platform built on Node.js — the modern developer-first alternative to Shopify. Free to self-host with unlimited products, orders, and regions, a customizable data model, and a composable backend (modules for cart, order, payment, fulfillment); you bring your own frontend (Next.js, Remix) and a Postgres database. Medusa Cloud offers a hosted tier (trial, then paid), but the self-hosted core is fully free and open-source.