CALDSoft is described as 'CALDsoft performs automatic unfolding calculations based on the required items dimensions, with easy creation of drawings for budgeting and manufacture, included weight calculations. In order to use the program the user does not require extensive design knowledge'. There are four alternatives to CALDSoft for Windows. The best alternative is Autopol. Other great apps like CALDSoft are Sheet Lightning (Paid), Plate'n'Sheet (Paid) and Cone Layout (Paid).
Sheet Lightning the 3D CAD pattern unwrap software for duct, chute, flues,chimneys etc. Create and unfold sheet metal duct, structural steel and fabrication designs for manufacture. Includes a predefined parametric library.
Cone Layout is a program to unfold a frustum of a cone and generate a sheet cutting layout or flat pattern projection that can be rolled or bend up into a truncated cone shape. Either side of the truncated cone can be tilted.