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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.
Looks like they aren't being very transparent with their source code. There hasn't been any update to their GitHub repository since September of 2021: https://github.com/Punkt-Tronics-AG/Pigeon
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.