FreeCAD

FreeCAD is an open-source parametric 3D modeling tool designed to create and modify real-life object designs of any scale. It allows users to sketch 2D shapes that can serve as a foundation for 3D objects, featuring robust flexibility and customization suitable for product design, mechanical engineering, and architecture. Notable features include a broad Python API, cross-platform compatibility (Windows, macOS, Linux), and the ability to utilize a powerful geometry kernel (OpenCASCADE) along with the Coin3D library for 3D visualization.