IGiS CAD is described as 'Powerful 2D drafting and 3D modeling software for professionals to design. plan, execute and analyze their projects with precision. It can be used in Architecture, Engineering, Construction, Mechanical, Urban Planning, and many more' and is an app. There are more than 100 alternatives to IGiS CAD for a variety of platforms, including Windows, Mac, Linux, Web-based and iPad apps. The best IGiS CAD alternative is FreeCAD, which is both free and Open Source. Other great apps like IGiS CAD are SketchUp, LibreCAD, Autodesk AutoCAD and OpenSCAD.