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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.
In case you weren't aware, its source code is public, and, while lacking a license, I believe I mentioned that it's public domain in the past. https://github.com/redditnfl/front-end. Its architecture is a bit old, gulp is not the most modern build tool, but things should still work in 2023.
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.