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Here is 10 Free and useful computer-aided design software. Computer-aided design (CAD) is a combination of computer programs and systems that allow engineers and architects to design detailed two- or three-dimensional models of physical objects, such as mechanical parts, buildings, and molecules. It specially used to design curves and figures in two-dimensional ("2D") space; or curves, surfaces, and solids in three-dimensional ("3D") objects. There are so many "free" CAD programs out there but only a handful are either really free or useful.