What is a software program used to create facial composites?

Blender is a good option, but you'll need several kinds of softwares to make a good data capture from a correct interpretation from the original source and you'll also need to convert those image scan 2D files (Dicom extention), into a 3D or 4D format like *.ply, *.stl or *.obj (just to name the more important file formats on this area).