PDSView

PDSView enables you to view and annotate graphic files stored in PDS format. This graphic format is not widely used, and my guess is that there aren't many applications which can handle files of this kind.

This program is also able to convert PDS files to popular formats like GIF, TIFF, PS, and PDF. It runs smoothly on both 32- and 64-bit systems.

PDSView comes with an organized graphical user-interface. Taking into consideration that PDS files usually contain large graphs, the main window can be resized in order to provide you with as much working space as possible. Of course, PDSView includes a zooming tool, but it might not be a viable solution. When testing this particular feature, the application responded slowly.

Whenever you need to make annotations on a PDS file, you can use objects, such as lines, arrows, rectangles, pieces of text and "callout boxes". In addition to this, you can use the integrating vertical cropping tool to select and crop parts of a PDS file.

To conclude with, I think that PDSView is a well-designed program that comes in handy whenever you need to open files stored in not-so-common PDS graphic format.