FreeCAD features tools similar to CATIA, Creo, SolidWorks, Solid Edge, NX, Inventor, Revit, and therefore also falls into the category of building information modeling, mechanical computer-aided design, PLM, CAx and CAE. It is intended to be a feature-based parametric modeler with a modular software architecture, which makes it easy to provide additional functionality without modifying the core system. As with many modern 3D CAD modelers, it will have a 2D component to facilitate 3D-to-2D drawing conversion. Under its current state, direct 2D drawing is not the focus for this software, neither are animation or 3D model manipulation. However, the modular nature of FreeCAD will allow the user to adapt its workflow for such environments. FreeCAD uses open-source libraries from the field of computing science; among them are Open CASCADE Technology, Coin3D, the QtGUI framework, and Python, a popular scripting language. FreeCAD itself can also be used as a library by other programs. There are moves to expand FreeCAD in the architecture, electrical, and construction engineering sectors and to add building information modeling functionality with the Arch Module.
Supported file formats
FreeCAD's own main file format is FreeCAD Standard file format. It is a standard zip file that holds files in a certain structure. Document.xml file has all geometric and parametric objects definitions. GuiDocument.xml then has visual representation details of objects. Other files include brep-files for objects and thumbnail of drawing. Besides FreeCAD's own file format, files can be exported and imported in the following file formats: DXF, SVG, STEP, IGES, STL, OBJ, DAE, SCAD, IV and IFC.
FreeCAD's support for the important DWG file format has been problematic due to software license compatibility problems with the GNU LibreDWG library. The GNU LibreDWG library started as a real free alternative to the source-availableOpenDWG library and is licensed under the GPLv3. As FreeCAD has dependencies on Open Cascade, which prior to version 6.7.0 was only compatible with GPLv2, it couldn't use the GNU LibreDWG library as GPLv2 and GPLv3 are essentially incompatible. Open CASCADE technology was contacted by Debian team in 2009, and 2012 got a reply that Open CASCADE technology was considering dual-licensing OCCT, however they postponed that move. A request also went to the FSF to relicense GNU LibreDWG as GPLv2 or LGPLv3, which was rejected. As of 2014 the 0.14 release of FreeCAD, including the new LGPL release of Open Cascade, the BSD-licensed version of Coin3D, and the removal of PyQT, FreeCAD is now completely GPL-free. However, LibreDWG has not been adopted. FreeCAD is able to import and export a limited subset of the DWG format via the .
