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!
You can find more information here.
Note: From September 16 on, you can buy your pdfToolbox license(s) with the assurance that you can upgrade to version 12 for free once it is officially released.