FreeCAD Overview
FreeCAD is a free, open-source parametric 3D CAD modeler for Windows, macOS, and Linux, aimed at product design, mechanical engineering, and architecture. Being parametric, models are driven by a history of features and constraints, so you can go back and change dimensions and the model updates accordingly. It is organized into workbenches for different tasks — part design and sketching, assembly, technical drawing generation, finite-element analysis, and more — and it can read and write many CAD formats including STEP, IGES, and STL for 3D printing. It is a capable free alternative for parametric design. As a single complete installer, FreeCAD finishes setup on a machine that has no connection. A built-in Python console and macro system automate repetitive tasks, and a spreadsheet workbench can drive model dimensions from data. Use the link on this page to reach FreeCAD's official FreeCAD download.