callas pdfToolbox Desktop

callas pdfToolbox Desktop is the easiest yet most powerful PDF preflight and correction application on the market. You can fix PDF problems during preflight or with a click of the button in the Switchboard. Flatten transparency, convert fonts to outlines, convert office documents or even PostScript directly into PDF, compare versions of PDFs, visualize ink coverage … no task is too difficult for callas pdfToolbox Desktop.  

Note:
The Desktop can be installed on both Mac and Windows, but can only be used by 1 user at the same time.

You can find more information here.