Please check the below marketplace solution for PrestaShop and Magento marketplace website, which are very easy to integrate on your ecommerce websites.
1. Magento Multivendor Marketplace Extension:
>> It will support to develop B2C marketplace websites
>> You can setup the commissions for each Sellers, Products, Category, Customer Group and Product Type
>> You can easily configure the commission for the sellers and you can see the commission & order amount under seller payout options
>> Under seller panel you can configure the shipping cost based on product cost, quantity and price
To know more: Magento Marketplace Extension
2. Prestashop Multivendor Marketplace Module:
>> Convert your Pretashop eCommerce store into Marketplace
>> Set commissions for Products and Categories
>> Built with most of the trusted 3rd party carriers – UPS, USPS, Canada Post, AU Post, FedEx etc.
>> Seller interface to manage profile, products, orders, invoices, shipping, and delivery.
To know more: PrestaShop Multi Vendor Marketplace & Dropshipper module