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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.
My Open Realm of Stars has one. It is free and open source game so trying it out does not cost anything. Github link and Itchio link.
NOTE:
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Hence, a higher number means a more popular project.