Shuup - Multivendor Marketplace Ecommerce Software - Let vendors sell products, services, and digital goods through your ecommerce marketplace.
MarketplaceKit - MarketplaceKit is a platform for building different types of online marketplaces.
WBSPRO - Install, Connect and Promote
Sharetribe - Build your online marketplace business. You don't need a developer.
Kait.ai - Connecting People With Brands
JaJuMa-Market - All-In-One Multi-Vendor / Online Marketplace Solution. Various Business Models supported.