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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.
No need to use official maps (of course, you can download whatever region officially), but you can use OSM maps for example https://garmin.vasam.cz and download it by the country - on vadám page are generally Europe maps
NOTE:
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Hence, a higher number means a more popular project.