Many CAD / 3D modeling tools should nowadays have a PDF export function by default, either for the purposes of printing simple static 2D previews or even 3D PDF export, which creates a preview of 3D models inside the PDF document.
Open DWG file Open PDF fileA CAD and Gerber conversion software
A 3D product data optimalization software
A simple DWG/DXF to PDF converter
A free AutoCAD publishing solution
3D CAD/CAM tool for product development
An online CAD conversion service
A CAD converter with huge format support
One of the many file converters
A dedicated 2D/3D CAD software
Old CAD and GIS software
A commercial online CAD converter
An electrical CAD software for automation
A landscape graphics design software
A free graphics editor