Primo PDF is free software that enables you to create pdf files. I have been using it for years and it works well. I suggest anyone submitting documents to be placed on the QSY Society website submit pdf files, as they make it much easier for everyone to print.
For more info and to get it visit primopdf.com
At my work QTH we use Cute PDF, http://www.cutepdf.com/. It is part of our site wide configuration and is the PDF writer is free for personal and commercial use.