ARCAT BIM content - Architectural Building Information Modeling (BIM) objects / families / system files, free to download in revit or dwg formats for use with all major BIM and CAD software including AutoCAD, Sketch-Up, ArchiCAD and others. Formats: RFA- Revit Object | RVT- Revit System | DWG- AutoCAD, Sketchup - all cad software By downloading and using any ARCAT CAD detail content you agree to the following [license agreement]. Free Architectural CAD drawings, blocks and details for download in dwg and pdf formats for use with AutoCAD and other 2D and 3D design software.