Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Pepakura Designer - Pepakura Designer allows you to easily create papercraft models from 3D data you create from your...
SelfCAD - SelfCAD is an online 3D modeling and slicing software.
Ultimate Unwrap 3D - Ultimate Unwrap 3D is a standalone UV mapping software for unfolding and unwrapping 3D models.
SketchUp - 3D for Everyone
Ultimate Papercraft 3D - Ultimate Papercraft 3D is a standalone software for creating papercraft from 3D models.