LITIO is a sheet metal program that calculates flat (unfolded) sheet developments of ducts, rectangle to round transitions, cylinders, cones, pipe intersections, connections, bifurcations, elbows, etc. It is easy to use. No need of DFX conversions. Make your developments directly in AutoCAD.
For HVAC, hoppers, cyclones, dust extraction, ducts, conveying systems, silos, piping, etc.