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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.
The community will probably take over since it's open source, but the Cursebreaker dev said he is no longer going to be maintaining it himself.
These issues are the main reasons why Ajour's developer decided to quit.
NOTE:
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Hence, a higher number means a more popular project.