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ktfmt
A program that reformats Kotlin source code to comply with the common community standard for Kotlin code conventions.
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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.
Others have covered most of your questions, but since you asked about linters: if you want a highly opinionated formatter in the spirit of gofmt or google-java-format, you can check out ktfmt.
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.