QymCAD
Parametric 3D CAD with a real B-rep kernel (OpenCASCADE)
QymCAD is a free, open-source parametric 3D CAD application for mechanical design, product development, and manufacturing. It uses the OpenCASCADE boundary representation kernel to create precise solid geometry rather than polygonal approximations. Users can construct sketches with geometric constraints, mathematical dimensions, and associative references. Its modeling tools support extrusion, revolution, lofting, sweeping, fillets, chamfers, holes, and patterns. Parts can be combined into assemblies using configurable joints, movement limits, and interference checks. ...