Need help getting started with any of the Autodesk or Adobe Creative Cloud applications? Check out the tutorials on LinkedIn Learning , formerly Lynda.com.
MatterControl - Aside from being a 3D slicing software, MatterControl lets you make 3D designs from 2D images (photos, drawings, etc.) We've also used it to make 3D stencils from hand sketches.
TouchTerrain - Lets you create 3D models of topographic data (primarily U.S. data). Exports models as .STL files so they can be 3D printed.