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3DPrinting
3DPrinting is a place where makers of all skill levels and walks of life can learn about and discuss 3D printing and development of 3D printed parts and devices.
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So most of the big packages have a cheap or free tier for hobbyist/maker use, and I think they all do for educational use. The rub with most of these is that they are either not for commercial use (OnShape, Solid Edge CE), or they have "gotcha" thresholds ($1000 revenue for F360, $2000 profit for Solidworks).
Now if you wanted to go completely free-as-in-beer and still retain full commercial rights, you really have to go open source. Then there's also DesignSpark Mechanical, which is Windows only and not truly parametric, but is much more advanced than something like TinkerCad. They've got their own issues with feature erosion in the free tier, but because the company's main business is selling components, they haven't removed commercial use from it yet.