Parametric primitive creation (box, sphere, cylinder, etc).The relationship between objects is also stored, so modifying one object also modifies its dependent objects. Those parameters can be modified on the fly, and recomputed anytime. Parametric associative document objects: All objects in a FreeCAD document can be defined by parameters.Modules behave like plugins, and can be added or removed to an existing installation of FreeCAD. Almost all the tools and geometry types are stored in modules.

FreeCAD is divided into a core application and modules, that are loaded only when needed. Plugin/Module framework for late loading of features/data-types.This allows to display only the tools used to accomplish a certain task, keeping the workspace uncluttered and responsive, and the application fast to load. Workbench concept: In the FreeCAD interface, tools are grouped by workbenches.Like in console mode, the interface part of FreeCAD is unavailable, but all geometry tools are accessible. FreeCAD can be imported as a Python module, inside other applications that can run python scripts, or in a python console.It can be, for example, used as server to produce content for other applications. In command line mode, FreeCAD runs without its interface, but with all its geometry tools. FreeCAD also runs as a command line application, with low memory footprint.FreeCAD has a complete Graphical User Interface based on the famous Qt framework, with a 3D viewer based on Open Inventor, allowing fast rendering of 3D scenes and a very accessible scene graph representation. It runs and behaves exactly the same way on Windows Linux and Mac OSX platforms. FreeCAD runs exactly the same way on Windows, Mac OSX and Linux platforms. FreeCAD is based on OpenCasCade, a powerful geometry kernel, features an Open Inventor-compliant 3D scene representation model provided by the Coin 3D library, and a broad Python API. It is 100% Open Source and extremely modular, allowing for very advanced extension and customization. FreeCAD is a general purpose feature-based, parametric 3D modeler for CAD, MCAD, CAx, CAE and PLM, aimed directly at mechanical engineering and product design but also fits a wider range of uses in engineering, such as architecture or other engineering specialties.

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