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KotlinLanguageServer
Kotlin code completion, diagnostics and more for any editor/IDE using the Language Server Protocol
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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.
Kotlin has an unofficial language server implementation - https://github.com/fwcd/kotlin-language-server - you could probably use that and see how it goes.
NOTE:
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Hence, a higher number means a more popular project.