MarketplaceKit - MarketplaceKit is a platform for building different types of online marketplaces.
SocialPilot - SocialPilot is an app designed to help businesses and professionals with social media marketing.
Sharetribe - Build your online marketplace business. You don't need a developer.
Facebook for Business - Facebook Business gives the latest news, advertising tips, best practices and case studies to meet the business goals.
JaJuMa-Market - All-In-One Multi-Vendor / Online Marketplace Solution. Various Business Models supported.
Fomo - Fomo turns your site into the online equivalent of a busy store