Multi-Vendor On-Premises is a self-hosted marketplace builder that allows entrepreneurs to start large marketplaces and scale them easily. Comes with over 500 features, open source code and 1,700 live cases worldwide.
Dittofi Marketplace Solution - Build a custom marketplace in under 24 hours.
Clearbit - Clearbit provides Business Intelligence APIs
Sharetribe - Build your online marketplace business. You don't need a developer.
ZoomInfo - ZoomInfo is a B2B database providing detailed business information on people and companies.
SmartEngage - Cross-channel autoresponder for marketing automation
InsideView - InsideView aggregates and curates all the company and contact data, news and social insights, and professional connections you need to do business better.