Landofcoder Multivendor Marketplace - Magento 2 Marketplace Extension / Magento 2 Multi-Vendor Extension helps to convert your eCommerce store into a completely active multi-vendor marketplace like Amazon, Etsy or eBay, etc with multiple vendors and customers conducting transactions.
Sellbery - Easily automate product feeds from Shopify, Magento to Amazon, eBay and other marketplaces. Fully utilize the most profitable eCommerce channels and increase sales.
CS-Cart Multi-Vendor - On-premises eCommerce marketplace builder
Radial - Radial offers order management and store fulfillment solutions.
Yo!Kart - A Tailor-made Online Marketplace Software
eBay Enterprise - eBay Enterprise provides a variety of marketing, customer care, payment processing, fulfillment, fraud detection services.