The 3D-Tool Free Viewer is a dynamic viewer for 3D and 2D CAD files. This gives you the ability to Visualize, Cross Section, Measure/Markup and Explode Assemblies in 3D. It can read STL, 3MF files, and native 3D-Tool files (EXE/DDD), but does not provide the ability to save your modifications or markup files; for that you would need one of the low cost paid versions: Basic, Advanced, or Premium. The upgrade versions allow you to restructure assemblies, create exploded views, and animations using a very simple interface. Collaboration is easy, 3D-Tool produces zipped self-viewing executable files of your CAD projects, which can be e-mailed and displayed on any PC without pre-installation or licensing. The user interface allows anybody to view your models, zoom in on details, or simply look inside your models using dynamic cross sections. Views from any angle can be printed or saved as pictures.
Need to open more types of 3D model files, like OBJ, ASC, 3DS, even 2D DWG? Simply upgrade to a Basic license. Or, add Neutral file reading with the Advanced version (Step, Iges, Sat, Parasolid). The Premium upgrade will open up the ability to directly read most all major CAD system files; Solidworks, Creo, CATIA, NX, Inventor, Rhino. It comes with a Converter to convert those files to STEP or other Neutral file types.