ScottPlot.NET
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Ellipse

An ellipse can be placed on the plot and styled as desired.

This code sample is specific to ScottPlot 5 (details)
ScottPlot.Plot myPlot = new();

for (int i = 0; i < 10; i++)
{
    var el = myPlot.Add.Ellipse(0, 0, 1, 10, rotation: i * 10);
    double fraction = i / 10.0;
    el.LineColor = Colors.Blue.WithAlpha(fraction);
}

// force circles to remain circles
ScottPlot.AxisRules.SquareZoomOut squareRule = new(myPlot.Axes.Bottom, myPlot.Axes.Left);
myPlot.Axes.Rules.Add(squareRule);

myPlot.SavePng("demo.png", 400, 300);

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