running web app,

repo

A samples project hosted on GitHub to help developers
evaluate and use Flutter. The Gallery consists of a
collection of Material design widgets, behaviors,
and vignettes implemented with Flutter.
You can clone the project and run Gallery as a desktop app
by following the instructions provided in the README.

announcement blogpost,

repo

A Google contacts manager that integrates with GitHub and Twitter.
It syncs with your Google account, imports your contacts,
and allows you to manage them.

Photo Search app

A sample application built as a desktop application that
uses desktop-supported plugins.