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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.
You didn't mention your preferred language. If it's Java, check out libGDX. If it's C# check out either Unity or Godot. If you really want to get as lean as possible, more or less regardless of language, check out https://www.raylib.com/
NOTE:
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Hence, a higher number means a more popular project.