Take actions right from messages in Microsoft Teams

With Message Actions your app can initiate those actions directly from the message, closing the collaboration loop and keeping the communication lines alive.
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Add rich previews to messages using Link unfurling

Customize link previews for your app using App based link handling with Messaging extensions.
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Microsoft Teams App Studio (Preview)

Microsoft Teams is the hub for teamwork in Office 365 that integrates with the apps and services that people use to get work done together. Microsoft Teams App Studio (Preview) makes it easy to start creating or integrating your own service, whether you develop custom apps for your enterprise or SaaS applications for teams around the world.
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