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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 see freepats there, I actually don't use that package, but I did a lot of work on their wiki especially in their free software programs section. In fact I am going to add another one I just heard about last week called Mixxx.
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.