Is there any interactive spline fitting software?

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I'd like to know if there's any software (freeware) for interactive data interpolation. What I want is to be able to visualize my data on an XY plot and drag the points to see how it affects the interpolation curve and also get XY-coordinates for that curve. I tried to do this in Mathematica, but it doesn't seem to have the feature of interactively modifying the input.