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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.
Firebase Authentication or Auth0 could do a lot of the heavy lifting for you.
Many cloud providers include a free tier. For example, with Firebase you get this for free:
NOTE:
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Hence, a higher number means a more popular project.