From Software Companions:
ViewCompanion Pro (64-Bit) is an application for viewing, printing and converting HPGL, HPGL/2, HP-RTL, TIFF, CALS, and other formats. ViewCompanion Pro (64-Bit) helps you to n add markups to the loaded file. Its supported markup elements include rectangles, lines, dimension lines, area measurements, ellipses, polygons, text, arrows, stamps, and images. You can select one of the predefined stamps or create your own. User defined symbol libraries makes it easy to add frequently used symbols as markups. Hyper links can be added to markup elements, and a hyper link can either open another drawing in ViewCompanion Pro (64-Bit) , or open an Internet location using the default browser. It gives you advanced functions for zooming and panning, so that you can view your files fast and accurate, before printing or converting them.