At http://www.powershape-e.com you can get a full, free CAD design application from DELCAM. What is the catch? You can model and save at will, but to export the file into a common CAD format, you need to pay for the conversion. So as long as you want to learn and can afford to stay inside this application, it stays free.
Info on BIM, CAD & 3D software for architects and students
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