SolidCraft
Modelling with a live feature tree, in a tab or from the command line
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If you model the odd bracket or enclosure but resent a seat on Fusion or Onshape, this opens in a tab, costs nothing and keeps your geometry on your own machine.
NASSCAD V4.7.0 is a free solid modeller that opens in a tab, with an Electron build for Windows as installer or portable exe. You get parametric primitives, booleans, fillets and chamfers, plus STEP and IFC import; browser booleans run on Manifold compiled to WASM, and the Windows companion adds native speed and per-face STEP colours. It is AGPL-3.0 from NassLab in France. Hacker News testers were blunt: lagging tooltips, fillet previews taking minutes, and a 16,000-line C++ core.
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