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BansheeEngine
A free & modern multi-platform game development toolkit. It features low and high level engine systems, DirectX 11 and OpenGL support, complete asset pipeline, C# scripting support and a fully featured editor. (Note: Some systems are still a work in progress) (by duaneking)
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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.
the underlying foundation is still available https://github.com/GameFoundry/bsf
Also, here's the link
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Hence, a higher number means a more popular project.