saleor
Saleor Core: the high performance, composable, headless commerce API.
spree
Open-source commerce platform for fast growing businesses and enterprises. Supports complex commerce scenarios natively - from B2B wholesale to multi-vendor marketplace to global multi-region or multi-tenant ecommerce.
reactioncommerce
Project has been discontinued ////// Mailchimp Open Commerce is an API-first, headless commerce platform built using Node.js, React, GraphQL. Deployed via Docker and Kubernetes.
nopSolutions
ASP.NET Core eCommerce software. nopCommerce is a free and open-source shopping cart.