Autodesk 123D Design is described as 'Free download software to design 3d models for 3d printing and fabrication for Windows, Mac OS X, iphone, ipad' and is an app in the system & hardware category. There are more than 50 alternatives to Autodesk 123D Design for a variety of platforms, including Windows, Mac, Linux, Web-based and iPad apps. The best Autodesk 123D Design alternative is FreeCAD, which is both free and Open Source. Other great apps like Autodesk 123D Design are Sweet Home 3D, SketchUp, LibreCAD and Autodesk AutoCAD.