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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.
Flutter for the Web is developed alongside the other platforms in https://github.com/flutter/engine/tree/master/lib/web_ui and https://github.com/flutter/flutter . The frozen repo you might be thinking of is https://github.com/flutter/flutter_web which only contained the original prototypes and has since been merged into the repos I listed above.
I saw couple comments like "merge after freeze" https://github.com/flutter/website/pull/5364
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.