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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.
Java still works for 99% of things, but Google officially declared Android development as "Kotlin-first" back in 2019 and it's definitely where the new/latest stuff happens. For example: Compose is Android's new declarative UI framework (similar to React) and it's Kotlin-only.
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.