Here are some places where you can look for information about calcFD - Calculate the fractal dimensionality of a 3D structure:

Homepage
calcFD - Calculate the fractal dimensionality of a 3D structure has a homepage that can be found at https://github.com/cMadan/calcFD
Wiki
calcFD - Calculate the fractal dimensionality of a 3D structure has a wiki that can be found here.