The Amplify Framework is a comprehensive set of SDKs, libraries, tools, and documentation for client app development.
AWS AppSync is an enterprise level, fully managed GraphQL service with real-time data synchronization and offline programming features.
AWS Device Farm
AWS Device Farm is an app testing service that enables you to test your iOS, Android and Fire OS apps on real, physical phones and tablets that are hosted by AWS.
Amazon Location Service
Amazon Location Service helps you to easily and securely add maps, points of interest, geocoding, geofences, and tracking to your applications.
Amazon Pinpoint helps you engage your customers by sending them email, SMS and voice messages, and push notifications.
Amazon Simple Notification Service (Amazon SNS) is a web service that enables applications, end-users, and devices to instantly send and receive notifications from the cloud.
This is an introdution to AWS Front-End Web & Mobile Services
Reference : AWS Docs