The reference application for the HERE SDK for Flutter (Navigate Edition) shows how a complex and release-ready project targeting iOS and Android devices may look like.
A Flutter package which can be used to make polylines(route) from a source to a destination, and also handle a driver's realtime location (if any) on the map.
This is a Flutter package that uses the Google Maps API to make a TextField that tries to autocomplete places as the user types, with simple smooth animations, making a nice UI and UX.