ScottPlot is a free and open-source plotting library for .NET. This package can be used to create static plots, and user controls for displaying plots interactively are available as separate NuGet packages.
$ dotnet add package ScottPlotScottPlot is a free and open-source plotting library for .NET that makes it easy to interactively display large datasets.
The ScottPlot Cookbook demonstrates how to create line plots, bar charts, pie graphs, scatter plots, and more with just a few lines of code.
double[] xs = new double[] {1, 2, 3, 4, 5};
double[] ys = new double[] {1, 4, 9, 16, 25};
var plt = new ScottPlot.Plot(400, 300);
plt.AddScatter(xs, ys);
plt.SaveFig("console.png");

Drop a FormsPlot from the toolbox onto your form and add the following to your start-up sequence:
double[] xs = new double[] {1, 2, 3, 4, 5};
double[] ys = new double[] {1, 4, 9, 16, 25};
formsPlot1.Plot.AddScatter(xs, ys);

The ScottPlot Demo allows you to run these examples interactively.
The ScottPlot Cookbook demonstrates how to create line plots, bar charts, pie graphs, scatter plots, and more with just a few lines of code.
ScottPlot WinForms control: https://www.nuget.org/packages/ScottPlot.WinForms
ScottPlot WPF control: https://www.nuget.org/packages/ScottPlot.WPF
ScottPlot Avalonia control: https://www.nuget.org/packages/ScottPlot.Avalonia