Which AWS service is integrated not only with AWS but also with Twitch?

Amazon Lumberyard is the correct choice because it is specifically designed for game development and has built-in integration with Twitch. This allows developers to create engaging multiplayer experiences and streaming capabilities directly within their games, tapping into Twitch's audience and functionality.

Lumberyard's integration with Twitch enhances gaming experiences by enabling features like broadcasting, viewer engagement, and personalized esports content, making it particularly appealing for game developers aiming to leverage the streaming community. The service also includes tools for working with AWS cloud services, but its standout feature is its close alignment with Twitch's streaming platform, allowing seamless interactions between gamers and audiences.

The other services mentioned do not offer this specific partnership with Twitch. For instance, Amazon GameLift is aimed at game server hosting. AWS Greengrass focuses on extending AWS services to edge devices. AWS IoT Device Management is tailored for managing IoT devices and applications, making them distinct from the functionality provided by Lumberyard in the context of game development and streaming.