1)   LITIO - 3D Sheet metal unfolding software 1.0 Sheet metal for AutoCAD. It calculates flat (unfolded) sheet development of ducts, rectangle to ound transitions, cylinders, cones, intersections, connections, bifurcations, elbows, etc. For HVAC, hoppers, cyclones, ducts, silos, piping, etc. 2)   KzxCadT 1.0 KzxCadT is a very powerful cad designing package software with a full visual environment.All the standard tools in hand as circles, lines, rectangles, arcs and plus the special shapes as obrounds, DD & D slots very used in sheet metal shopsand more.. 3)   LITIO - 3D Sheet metal unfolder 1.0 Sheet metal for AutoCAD. It calculates flat (unfolded) sheet development of ducts, rectangle to ound transitions, cylinders, cones, intersections, connections, bifurcations, elbows, etc. For HVAC, hoppers, cyclones, ducts, silos, piping, etc.