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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.
For Android, I have used Catima. It is an wallet app for loyalty cards etc, but can use it for all sorts of barcodes or QR codes etc. And free/open source. https://catima.app/
NOTE:
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Hence, a higher number means a more popular project.