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GNU LibreDWG is a software library programmed in C to manage DWG computer files, native proprietary format of computer-aided design software AutoCAD. It aims to be a free software replacement for the OpenDWG libraries. The project is managed by the Free Software Foundation (FSF).
Application Developer Platform Latest release License 3D support? User Interface Language(s) Supported format(s) Version Date Caddie: Advanced Computer Solutions
LibreCAD is a computer-aided design (CAD) application for 2D design. It is free and open-source, and available for Unix/Linux, macOS, and Windows operating systems.. Most of the interface and handle concepts are analogous to AutoCAD, making it easier to use for users with experience in this type of commercial CAD application.
FreeCAD's support for the proprietary 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-available OpenDWG library (later Teigha Converter and now ODA File Converter) and is licensed under the GPLv3.
ZWCAD is compatible with widely used 2D CAD drawing formats (such as DWG, [6] DWT, DXF, DWF) and can directly read and save common graphics information. In addition, ZWCAD's interface and usage are similar to those of other 2D CAD software. ZWCAD can run on both Windows and Linux operating systems.
In 2007, new features were added to the viewer: an editor and a converter. The application got a full set of editing tools for design and project work. As a converter, ABViewer made it possible to convert selected parts of the image. ABViewer 6 was available in three versions (Standard, Professional and Enterprise). [6]
The ODA also provides a freeware stand-alone viewer for .dwg and .dgn files, ODA Drawings Explorer, which runs on Windows, Linux, and Mac OS X. LibreCAD is a free and open-source 2D CAD application that can open DWG and DXF files using its own library.
Open Design Alliance is a nonprofit organization creating software development kits (SDKs) for engineering applications. ODA offers interoperability tools for CAD, BIM, and Mechanical industries including .dwg, .dxf, .dgn, Autodesk Revit, Autodesk Navisworks, and .ifc files and additional tools for visualization, web development, 3D PDF publishing and modeling.