LibreCAD
LibreCAD is a cross-platform 2D CAD program. It can read DXF/DWG, and write DXF/DWG/PDF/SVG files. It supports point/line/circle/ellipse/parabola/hyperbola/spline primitives. The GUI is highly customizable, and has dozens of translations.
Alternatives
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LinuxCNC
LinuxCNC controls CNC machines. It can drive milling machines, lathes, 3d printers, laser cutters, plasma cutters, robot arms, hexapods, and more.
OpenSCAD
OpenSCAD - The Programmers Solid 3D CAD Modeller
AutoCAD
Autodesk's CAD software for 2D drafting and 3D modeling in architecture, engineering and manufacturing.
CNCjs
Web interface for CNC milling controllers running Grbl, Smoothieware, or TinyG.
Fluidd
Lightweight & responsive user interface for Klipper, the 3D printer firmware.
FreeCAD
Official source code of FreeCAD, a free and opensource multiplatform 3D parametric modeler.