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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.
Outside of Google, there are also high profile uses of Flutter. BMW used Flutter for MyBMW (https://flutter.dev/showcase/bmw). An even more interesting use case for Flutter is the one being done by Toyota, who are using Flutter for their infotainment systems (https://flutter.dev/showcase/toyota). Finally, back to the tech industry, Canonical is using Flutter to develop Ubuntu's installer (https://github.com/canonical/ubuntu-desktop-installer).
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.