We are not sure with your exact requirement of the Marketplace. But in the Market there are various of extension available for the Magento Open Source. One of which is Magento 2 Marketplace Extension by Landofcoder. Or you can also use this cedcommerce Magento 2 Marketplace extension.
I hope it will help you.
Thanks
This reply was modified 1 year, 4 months ago by Pankaj Sharma.