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bgfx
Cross-platform, graphics API agnostic, "Bring Your Own Engine/Framework" style rendering library.
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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.
[2]https://github.com/DiligentGraphics/DiligentEngine
I stumbled upon this looking into BGFX[1]. I've been looking for an abstraction layer over Vulkan and Metal and it has come down to BGFX and Diligent Engine[2]. Diligent is still a bit lower level than I'd like, so I started poking around to see who was using BGFX. I was surprised to find Microsoft is using it in their C++ version.
[1]https://github.com/bkaradzic/bgfx
NOTE:
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Hence, a higher number means a more popular project.