Without Prawn I probably wouldn't have been able to do the web version of my software in an acceptable amount of time.  It is amazing software -- far superior to every other way I have found to render PDFs, and I come from Enterprise Java where that is practically a religious calling.<p>Incidentally, although this use is quite off-label: Prawn exposes a very nice API for drawing arbitrary geometrical objects.  ImageMagick/GraphicsMagick can convert PDF files to image files in your favorite format.  This means you can use prawn to draw, e.g., an org chart for about a fiftieth of the pain it would take to draw it using graphics primitives in ImageMagick or what have you.<p>That reminds me -- I tried to throw money at the developers and they requested I send it to Heifer International.  Somebody is getting a cow because I didn't have one writing my print jobs.