FreeCAD
Parametric 3D modeling software that can produce, edit, export, analyze, and create 2D drawings of solid models.
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About FreeCAD
FreeCAD is an open-source parametric 3D modeler made primarily to design real-life objects of any size.
What you can do
Creates geometry-constrained 2D sketches that can serve as the basis for other modeled objects.
Builds parametric models whose shapes recalculate from editable properties while retaining modeling history.
Constrains and assembles components in 3D and animates the resulting assembly.
Imports and exports model data in formats including STEP, IGES, OBJ, STL, DWG, DXF, SVG, IFC, and FreeCAD's FCStd.
Automates and extends workflows through an integrated Python console, macros, custom tools, and custom workbenches.