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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.
If you don't mind something experimental, there is a C# version of Urho3D that is in fairly active development. There is also a C#-scriptable branch of the Urho3D fork, rbfx, located here. Both of these projects are still pretty in-the-works, but are still pretty usable.
Check out Raylib and its c# binding.
NOTE:
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Hence, a higher number means a more popular project.