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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.
You could use Budget with Buckets. It's free to use, but you can get a license too. Downside: it doesn't have an app (well, it does, but it's read only and sucks big time).
NOTE:
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Hence, a higher number means a more popular project.