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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.
Depending on how much effort you want to put in to this, you might consider something like Nakama: https://github.com/heroiclabs/nakama
It has a Godot client library as well: https://github.com/heroiclabs/nakama-godot
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.