I use SolidWorks, but that doesn’t meet your needs/scope. I have it at work and use it regularly. One free source for 3D files is http://www.3dcontentcentral.com/default.aspx. They do have a few Arduino boards as well as comon components. I applaud this effort and while I’m not familiar with the software or stl or skp files, I am now going to look into it. Thanks!
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