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JoltPhysics
A multi core friendly rigid body physics and collision detection library, written in C++, suitable for games and VR applications.
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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.
It is a very wide standard, yes. But the most issue is that it uses discrete collision detection which has pretty common limitations. So if you are looking for an alternative, try Jolt instead. It's open-source, MIT licensed, used by a AAA game and uses continuois collision detection.
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.