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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.
There are very few frameworks that I would personally recommend: the Servlet API and JAX-RS are pretty much the only ones I consider decent. I personally avoid JAX-RS because of https://github.com/jakartaee/rest/issues/468 and because you can replace most of its functionality using ~5-10 custom classes.
NOTE:
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Hence, a higher number means a more popular project.