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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 don't think it's unpopular. We need more and better game software, what exists today is unsatisfactory for a plethora of reasons. I'm personally interested in this because I ship Planimeter Game Engine 2D, which comes with client-side prediction standard, and it's the largest pure-Lua game engine on GitHub.[1]
[1]: https://github.com/Planimeter/game-engine-2d
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.