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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.
If you are open to certain compromises then the .net nano framework is still alive. https://www.nanoframework.net I know, I know it’s not Java, but C# but hey…
NOTE:
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Hence, a higher number means a more popular project.