Hi Ricardo Sánchez ,
Yes, Microsoft has two Marketplace storefronts that allow partners to list offers and enable trials: Azure Marketplace and Azure Appsource. The main difference is that Marketplace is geared more towards IT professionals offering infrastructure solutions, whereas Appsource is more geared towards line-of-business decision-makers offering finished line-of-business apps. See: How to choose between Azure Marketplace and AppSource.
If you're looking specifically to add integrations, you can submit a request to publish your application in Azure Active Directory application gallery. When you add applications to the app gallery, the applications become publicly available for users to add to their tenants, and users can configure SSO and automated user provisioning.
Let me know if this helps and is what you are looking for.
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