ViewCompanion Pro? is a very powerful application for viewing and printing HPGL, HPGL/2, TIFF, CALS and other formats. The HP-RTL format is also supported, so HPGL/2 files with embedded pictures will be shown correctly.
Markups can be added to the loaded file, and among the supported markup elements you will find rectangles, ellipses, polygons, text, arrows and images.
Markup elements will be stored in a separate file. The original file will be left unchanged.
More info:
hxxp://www.softwarecompanions.com/vcpro.html