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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.
FaceUnity (apparently they don't have English page for the development center, but Google translate works.). Sample code with Agora in Native - it should be very similar to implement the same for Unity.
NOTE:
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Hence, a higher number means a more popular project.