Firebase
Firebase is a Backend-as-a-Service (BaaS) app development platform that provides hosted backend services such as a realtime database, cloud storage, authentication, crash reporting, machine learning, remote configuration, and hosting for your static files.
Firebase supports Flutter. For more information, see:
- Getting started with Firebase and Flutter in the Firebase docs
- Firebase for Flutter codelab
- FlutterFire plugins
Also, the Flutter community has created docs and videos that you might find useful:
- Building chat app with Flutter and Firebase
- Using Firestore as a backend to your Flutter app (video)
- Live Coding Firebase Authentication with Flutter (video)
- Flutter & Firebase Auth 01 (video)
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[Flutter: Firebase Tutorial Part 1 Auth and Sign in]video4 (video)