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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.
Rollback netcode addon for Godot: https://gitlab.com/snopek-games/godot-rollback-netcode
SG Physics 2D: https://gitlab.com/snopek-games/sg-physics-2d/
That said, there's also a Multirun addon that I've seen other people use and that I should check out as well (I'm new to multiplayer game development).
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.