MacDraft is described as 'Professional, powerful 2D CAD, drafting, technical illustration, architectural drawing and more in one easy-to-use, CAD software package' and is an app in the Photos & Graphics category. There are more than 50 alternatives to MacDraft for a variety of platforms, including Windows, Mac, Linux, Online / Web-based and iPad. The best alternative is FreeCAD, which is both free and Open Source. Other great apps like MacDraft are SketchUp (Freemium), LibreCAD (Free, Open Source), Autodesk AutoCAD (Paid) and SOLIDWORKS (Paid).
Free CAD software for your DWG and DXF files: A new 2D CAD product that provides professional CAD users, with a better way to read, write and share DWG files. Portable 2D CAD application for Windows with DWG/DXF support
iPocket Draw is a vector drawing program comprehensive (CAD 2D), which offers to you total control over your drawing. Of course all the simple drawing tools are available: line, rectangle, oval, arc, polygon, text.
gCAD3D is a 3D CAD CAM application that features an integrated 3D OpenGL viewer, a program interpreter for geometry and NC-commands in 3D, an integrated NC-processor, and a programming interface for user programs.