The best-known tool is, of course, Adobe Acrobat, and no wonder: Adobe Systems created the PDF standard. But what if you have a job where you need to make new PDFs and your sources are already-created PDF documents? Or if you need to update your company's finished PDFs? The choice of applications that actually allow you to change a PDF after it was created is more limited. There is certainly no lack of tools - ones that are good and free - to help you create PDF documents.
