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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.
...and it seems like the dev hasn't put any time into working on the application since 2020? Someone submitted a pull request in 2021 to fix a bug relating to the start of a period cycle, the scroll library is apparently out of date, and apparently doesn't have time to implement new features like an ovulation predictor or even a data export feature (which would be trivial).
NOTE:
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Hence, a higher number means a more popular project.