FreeCAD - An open-source parametric 3D modeler
Ultimate Unwrap 3D - Ultimate Unwrap 3D is a standalone UV mapping software for unfolding and unwrapping 3D models.
SketchUp - 3D for Everyone
DXF2papercraft - DXF2papercraft converts a polygonal 3D model stored as DXF file into a plain drawing in the form of...
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Ultimate Papercraft 3D - Ultimate Papercraft 3D is a standalone software for creating papercraft from 3D models.