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Silk.NET
The high-speed OpenGL, OpenCL, OpenAL, OpenXR, GLFW, SDL, Vulkan, Assimp, WebGPU, and DirectX bindings library your mother warned you about.
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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.
There's nothing as simple as processing or p5.js the only alternative would be to use the SDL or GLFW capabilities of Silk.NET. There's a lot of tutorials online for SDL so you could follow any C/C++ tutorial. Silk.NET is just a wrapper for SDL so the methods used to do things should be the same as the C/C++ tutorials.
It seems to have the ability to draw geometry (and much more -> https://github.com/craftworkgames/MonoGame.Extended/blob/develop/src/cs/MonoGame.Extended/Math/ShapeExtensions.cs
It does seem a bit light around the documentation side. But there seems to be some good samples, the tutorials demo project (https://github.com/craftworkgames/MonoGame.Extended-samples/tree/master/src/Demos/Tutorials) might be a good thing to start with.