Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Adobe Acrobat DC - Make your job easier with Adobe Acrobat DC, the trusted PDF creator. Use Acrobat to convert, edit and sign PDF files at your desk or on the go.
FreeCAD - An open-source parametric 3D modeler
Wondershare PDFelement - All-in-one PDF editor
meshmixer - meshmixer is an experimental 3D modeling tool for making 3D mashups without too much hassle.
Foxit Reader - Foxit Reader is a free and light-weight multi-platform PDF document viewer.