3D-Tool is described as '2D/3D CAD-Viewer and Converter'. There are more than 10 alternatives to 3D-Tool for a variety of platforms, including Windows, Linux, Online / Web-based, Mac and Android. The best alternative is CAD Assistant, which is free. Other great apps like 3D-Tool are STP Viewer (Free), A360 VIEWER (Free), eDrawings Viewer (Freemium) and 3D Viewer Online (Freemium).
A360 Viewer is a free online viewer for 2D and 3D designs including AutoCAD DWG, DXF, Revit RVT and Inventor IPT, as well as STEP, SolidWorks, CATIA and others. These file types can be viewed with the online A360 viewer, the free version of A360, and the paid version, A360 Team.
3D viewers for CATIA V4/V5/V6, STEP, IGES, Creo, Pro/ENGINEER, NX, JT, SolidWorks, Solid Edge and Inventor files. Take accurate measurements, cut dynamic sections, compare differences between models, review changes. View and search attributes. View, search and filter PMI.