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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 chose timetagger.app (github repo) and only a couple days after getting everything running I found the web app quite pleasant to use. I highly recommend it if interested in something like this.
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Hence, a higher number means a more popular project.