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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.
Sadly the marketing department failed utterly, somehow thinking they could sell CFD to... the same kind of kids that spend 200 bucks on loot boxes. I think the absolutely batshit insane potential for dynamic 2D gameplay was barely scratched before they sold the code to Google (creating the LiquidFun project) and went their separate ways. These days the engine has branched into a lot of things, notably a 3D industrial version called ParticleWorks which is a CAD plugin for bringing SPH to mechanical engineering.
NOTE:
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Hence, a higher number means a more popular project.