Swell.is - Customizable, API-first ecommerce platform for innovative brands, startups, and agencies.
Shopify - Shopify is a powerful ecommerce platform that includes everything you need to create an online store and sell online. Try it free for 14 days.
Vendure - Open-source headless e-commerce framework for developers
Commerce.js - Rapidly create eCommerce experiences on web and mobile
Shopify App Store - The most powerful ecommerce app store
Headless Commerce Resources - Curated collection of the best commerce resources