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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.
Unity's package is, from what I understand, an imitation of Mirror (which is kind of ironic given the name) but I don't know if they have improved it since I last checked. At that point, you might want to consider Mirror instead.
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.