For 3D CAD on a budget (or free for some users), I've heard some really good things about
Autodesk Fusion 360.
I think it's interesting that they are offering some fairly serious software for free, for real, and not just to students:
Quote:
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A free 1-year startup license is available for hobbyists, enthusiasts, makers, and emerging businesses that make less than US$100,000 in revenue per year. At the end of 1 year, you can reselect the startup entitlement or transition to a commercial entitlement.
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If one has to move beyond "free", one can go subscription for $40/month or $300/year.
(Autodesk Inventor user here; almost no personal experience at this point with Fusion 360.)