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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Time Tracking app with Flutter & Firebase - an example app by Andrea Bizzotto
pub.dev is the official package repository for Dart and Flutter apps. I found it very clean and developer-friendly. Pub.dev promotes high-quality packages via the Flutter Favorite program and Package of the Week YouTube show.
If you are not ready to install Flutter locally, you can also use DartPad, an online Dart & Flutter playground
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.