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OpenS-CAD, a simple 2D CAD application Have you ever wondered how a 2D CAD application is designed and implemented? I have, so I decided to sit down and write one. Now, implementing a fully functional 2D CAD is a tremendous task for a single person, and not something that can be completed in just a couple of months when only working on it on and off in the evenings. So, what I have implemented so far is the basic framework and only the most basic tools, but it does demonstrate how a CAD application could be implemented.