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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 wrote https://github.com/Zhuinden/guide-to-kotlin/wiki a few years ago for people who know Java and don't know Kotlin, I've heard many positive feedback for how simple it is to transition from Java to Kotlin once reading through it.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.