QCAD - The Open Source 2D CAD. QCAD is a crossplatform CAD solution for Windows, Mac OS X and Linux. It supports the DXF format and optionally the DWG format (through a proprietary plugin).
LibreCAD is a cross-platform 2D CAD program written in C++11 using the Qt framework. It can read DXF and DWG files and can write DXF, PDF and SVG files. The user interface is highly customizable, and has dozens of translations.
