A curated list of useful (highly subjective) Flutter packages sorted by topic. If you find a good one please put it in the comments.

UI

**flutter-search-bar
A simple and mostly automatic material search bar for flutter (dart).
https://github.com/ArcticZeroo/flutter-search-bar

Layout Process

after_layout Flutter and Dart package - Execute code after the first layout of your widget has been performed, i.e. after the first frame has been displayed.
https://pub.dartlang.org/packages/after_layout

Utilities

package_info provides an API for querying information about an application package.
https://pub.dartlang.org/packages/package_info