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A curated list of samples
Contained in this list are sample apps, demos, and examples that can help you grow your Flutter skills. Some are maintained here by the Flutter team, but many have been created by the Flutter community and are kept in other repos in and out of GitHub.
This is not an exhaustive list of samples, and just because a project isn't listed here doesn't mean that it's not worth exploring. Similarly, while the Flutter team works to keep this list up to date, there are plenty of others created by the community, such as Awesome Flutter from @Solido.
Please don't submit pull requests directly updating this file. While we're always happy to learn of new samples from the community, we need to keep this file small. There are plenty of user-maintained indices (like Awesome Flutter) that are meant to be exhaustive, and those are great places for submitting your own work.
How-to Collections
Flutter Examples 
A collection of single-topic examples from Nishant Srivastava. These include everything from gradients to JSON to routing and more.
Flutter Example Apps 
Several dozen examples from Flutter GDE Pawan Kumar. These cover state management, Firebase, UI design, and many other topics. Each one comes with a YouTube video showing implementation.
Flutter by Example 
Twenty-odd samples detailing common tasks with Flutter: how to use text fields, streams and StreamBuilders, and more.
Architecture / networking / backend
Flutter Architectural Samples 
Brian Egan's implementations of TodoMVC using a variety of state management and
architectural approaches. If you'd like to see how an app built with
flutter-redux is different from one using BLoC, this is a great place to
start.
jsonexample (Flutter team)
A simple app showing three different approaches to deserializing JSON:
hand-written constructors, json_serializable, and built_value.
provider_counter (Flutter team)
The simplest possible app (the counter) using provider
for state management. (This was previously known as scoped_model_counter,
and used scoped_model for state management.)
UI
Veggie Seasons (Flutter team)
Veggie Seasons is a published iOS app that displays seasonality, vitamin content, and trivia for a bunch of different fruits and veggies. If you're interested in learning how to use Flutter's Cupertino package to build interfaces for iOS, it's a great place to start.
Flutter UI Kit 
Another sample from Flutter GDE Pawan Kumar, this repo includes a variety of polished UI examples.
FlutterPlayground 
A repo full of short, specific examples (with animated screenshots!) showing commonly used widgets and how to put them to work.
Flutter Challenges
More a GitHub search result than a single repo, Matt Carroll's Flutter UI challenges showcase some amazing designs powered by Flutter. Make sure to check the accompanying YouTube video so you can watch Matt implement them.
Full apps
It's All Widgets!
Created and maintained by the Flutter community, It's All Widgets collects links to apps built with Flutter. Many are open source and include links to their source code, so you can browse through the list until you find something that looks interesting, and then go see how it was built.
inKino 
An unofficial Finnkino client that shows movies and showtimes of Finnkino cinemas in Finland. It uses Redux, has a comprehensive set of tests, and shares 40% of its code between the Flutter app and the AngularDart web app. It's currently available in the App Store, Play Store and as a Progressive Web App.
FlutterFlip 
A simple reversi clone built with Flutter. It showcases some implicit animations and how to move work off the UI thread into an isolate.
WhatTodo 
A simple todo app that tracks daily tasks, built using the BLoC Pattern. You can add projects, labels, and due dates to your tasks, and sort them using the same criteria.
Demos
Shrine (Flutter team)
The Shrine demo app from the Flutter team. It's designed to showcase how apps can put their own spin on the Material Design components and how to use ScopedModel to maintain app state across screens.
Flutter Gallery (Flutter team)
The official Flutter Gallery. There's tons of stuff in here. Just tons.