SolidCraft
Modelling with a live feature tree, in a tab or from the command line
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Anyone who has outgrown FreeCAD's quirks but will not pay for SolidWorks now has a permissively licensed option that an agent can drive over MCP.
SolidCraft is a free parametric CAD program written in Rust. You sketch with constraints, then build solids on an editable timeline: extrude, revolve, sweep, loft, fillet, shell, patterns, sheet metal and assemblies with joints. It runs as a desktop app on Windows, macOS and Linux, in the browser over WebGPU or WebGL2, as a headless CLI, and as an MCP server so an AI agent can model, measure and render parts. It imports and exports STEP, IGES, STL, 3MF, OBJ and DXF. The authors call it early but usable for simple parts, and 75 of 76 reference parts match expected geometry.
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