FreeCAD is a free and open-source parametric 3D CAD modeling application. Designed for a wide range of uses, including product design, mechanical engineering, and architecture, it enables users to design real-life objects of any size. With its parametric modeling approach, users can easily modify their designs by going back into the model history and changing parameters. FreeCAD offers a comprehensive set of features, including a modular architecture that allows for extensions via plugins, a full Open CASCADE Technology-based geometry kernel, support for common CAD file formats such as STEP, IGES, and STL, and an extensive Python API for scripting. It is cross-platform and available for Windows, macOS, and Linux, making it accessible to a broad user base.