Pepakura Designer - Pepakura Designer allows you to easily create papercraft models from 3D data you create from your...
FreeCAD - An open-source parametric 3D modeler
DXF2papercraft - DXF2papercraft converts a polygonal 3D model stored as DXF file into a plain drawing in the form of...
LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.
UV layout - UVLayout is a stand-alone application for the creation and editing of UV texture coordinates for 3D polymeshes and subdivision surfaces.
SketchUp - 3D for Everyone