How to Open DWG Files in Illustrator. The DWG format was originally designed by Mike Riddle in 1977 and licensed to AutoDesk Inc. in 1982 for creating two- and three-dimensional drawings.

VariCAD Viewer BRL‑CAD gCAD3D STP Viewer Let’s talk about these STP file viewer software in detail! FreeCAD FreeCAD is a free and open-source CAD design software that allows you to view STP files.