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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 do have an open issue to make a configuration of the app compatible with F-Droid's requirements for inclusion (https://github.com/zood/george/issues/67), and thus make Google Maps an optional requirement. However, if I focused on trying to achieve that first, Zood Location still wouldn't be available, and the app would be unappealing to most potential users as well.
NOTE:
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Hence, a higher number means a more popular project.