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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.
I work almost 100% in Scala because it has the most advanced functional features (proper pattern matching, higher-kinded types, typeclasses, ...) and very powerful metaprogramming abilities, while being compatible with the Java OO model as long as you consume Java libraries (the other way around can be tricky, Kotlin is much better there). Only Flix takes it further but it's still an immature project.
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Hence, a higher number means a more popular project.