AutoCAD supports both the formats from 3ds Max, as well as IGES CAD format (.igs, .iges), which makes it the natural option for 3ds to igs conversion. Except for that, you can find some alternative 3D modeling solutions with support of 3ds Max formats as well as dedicated 3D converters, such as the 3D Object Converter or Autoconverter.
Open 3DS file Open IGS file3D viewer and converter with a vast file type support