Flutter Starter is an open-source starter kit for building production-level apps in a jiffy.
It helps you bootstrap projects with all the essential modules like State Management, API calls, Styleguide, etc. Handle everything in one place so you don't have to rewrite the code.
Get started with this simple guide- https://techblog.geekyants.com/flutter-starter-guide-to-building-a-hacker-news-app