If your work with CAD files is limited to a single, powerful workstation, you can install a full viewer. But for the rest of the world—field technicians, traveling architects, IT support staff, and security-conscious engineers—.
: Highly regarded for its speed and low system resource consumption. It is available as a lightweight Windows application, a mobile app, and a web-based viewer that requires no installation at all. dwg viewer portable
: An open-source parametric 3D modeler. While more complex than a simple viewer, its portable version supports many formats including DWG (often requiring an external plugin) and DXF. If your work with CAD files is limited