Sure here's a quick list of freebies & open source one's - you really shouldn't be spending $ on it.
Most just show up like any other printer when they go to print, but some may have toolbars or something as well.
They simply print/save to pdf - then upload to zcs
+ I personally think all applications should have an easy way to export to pdf, it's just that common of a need.
(I personally use the first 2)
http://sourceforge.net/projects/pdfcreator/ http://www.cutepdf.com/ http://www.primopdf.com/ http://www.pdfforge.org/products/pdfcreator http://www.dopdf.com/ http://www.pdfpdf.com/pdf4free.html http://www.go2pdf.com/