The document discusses three different e-commerce platforms: Magento, Odoo, and RetailOn Multi Vendor Marketplace. Magento is an open-source e-commerce platform that provides features for marketing, catalog management, checkout/payments, orders, customers, and reporting. Odoo is an open-source ERP system that offers apps for accounting, inventory, CRM, website building, and e-commerce. RetailOn Multi Vendor Marketplace allows companies to create a marketplace by defining vendor roles, assigning resources, creating vendor accounts, and managing orders from multiple vendors.