FPGraph Tracer : great software to create FRD or ZMA file from graphic response curve

FWIW all your tracing desires can be accomplished with the tracing tool within VituixCAD.
A significant benefit of the SPL and impedance graph tracing tool within VituixCAD is that it automatically creates the phase response using a minimum-phase estimation process. That's very handy, as the phase response is always needed to help ensure the crossover simulations are as accurate as possible, in the absence of better, more complete data.