CAOdrive is described as 'Free online CAD viewer. Upload STEP, STP, IGES, IGS, OBJ and STL files and visualize them directly in the navigator. PC, Tablet or Mobile, all the devices are supported'. There are three alternatives to CAOdrive, not only websites but also apps for Windows. The best alternative is Online 3D Viewer, which is both free and Open Source. Other great sites and apps similar to CAOdrive are STP Viewer (Free) and 3D Viewer Online (Freemium).
View, Measure, Share and Embed 3D models and 2D drawings directly in your browser. No installation required, works on computers, smartphones and tablets. Files supported : STP, IGS, STL, PLY, OBJ with MTL, DXF, DWG