Sharetribe - Build your online marketplace business. You don't need a developer.
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.
MarketplaceKit - MarketplaceKit is a platform for building different types of online marketplaces.
instantecom - The FREE no code, no fuss, eCommerce platform!
JaJuMa-Market - All-In-One Multi-Vendor / Online Marketplace Solution. Various Business Models supported.
ReadyMage - Get your PWA store in 5 minutes