You will find here examples of how to create, style different types of Floating Action Button (FOB) and how Material Design 3 changed the FOB in Flutter.
Buttons: floating action button - Material Design
Flutter: Floating Action Buttons, by Wartelski.
Flutter FloatingActionButton: A complete tutorial with examples - LogRocket Blog
FloatingActionButton Widget in Flutter - Tutorial
Buttons: floating action button - Material Design
floating_action_wheel
Flutter Floating Action Button: A Complete Guide
Flutter Tutorial - 13 FloatingActionButton Widget
Flutter FloatingActionButton: A complete tutorial with examples - LogRocket Blog
Flutter - FloatingActionButton - GeeksforGeeks
How to create a Notched Bottom Navigation Bar Flutter