Who does not love free stuff. No strings attached free. CAD is computer aided design or also computer aided drafting. I do most all my CAD work in 3-D because I use my 3-D CAD models for animations, photo realistic renderings and prototypes.
There are times when you just need a 2-D drawing for you new invention and using 3-D is like killing a fly with a bazooka. Not to mention that 3-D programs are expensive the learning curves are quite steep. Check out DraftSight, it may be just what you next new invention.
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