progeCAD Professional is the most reliable Autodesk AutoCAD alternative, the low-cost 2D/3D DWG-native CAD, offering the AutoCAD look-and-feel, DWG 2014 and Windows 8 compatibility. It is a fully-functional, easy-to-use and low-cost CAD solution.
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IGiS CAD Alternatives
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.