DWG FastView software (version 5.5.0) is a CAD viewer and editor that allows users to view, edit, and annotate DWG/DXF files. Some of its most important features include the ability to open large files quickly, support for 2D and 3D CAD drawings, and the ability to measure distances and angles within drawings. The software also offers collaboration tools such as the ability to share files with others and add comments and markups to drawings.