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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.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
I don't know that it's one-to-one in terms of features, but I've been impressed with the Flix language, also on the jvm: https://flix.dev/ .
Java's projectreactor.io ? It is widely used in Java world, see Spring WebFlux.
NOTE:
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Hence, a higher number means a more popular project.
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