Software to plot transmittance of Bragg reflector?

We would like to design a distributed Bragg reflector with certain
properties. Sure, there are formulas for bandwidth and central
frequency, but then there are all these side peaks and whatnot. Is
there an inexpensive software package that will plot the transmittance
and reflectance of a structure with many, many layers? We would like
to be able to tweak the design and look at the predicted result.

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