From Tracker Software Products:
PDF-XChange is an Adobe compatible PDF file creation software. PDF-XChange offers an efficient compression and optimisation for PDF file generation. Create PDF files with ease from any Windows software application or if you are a Software Developer and would like information relating to the PDF-XChange SDK version to incorporate PDF-XChange in your applications for royalty-free distribution then the SDK could well be the right solution for you. PDF-XChange Pro is the as the Standard version with one additional application bundled, PDF-Tools.