Akeneo - Akeneo is an open-source Product Information Management solution.
Magento 2 Twitter Cards Extension - Social Sharing Tags Tool
Webcollage - Webcollage is a SaaS solution enabling brands to manage rich product information and publish it in real time to retailer websites.
Magento 2 Alternate Hreflang Extension - Alternate Tags Manager
Perfion - Perfion offers PIM solutions for organizations to use it across all their present and future marketing and commerce channels.
Magento 2 Dynamic Categories Extension - Automatic Product Generating Category