Here is my list of Free Software PDF projects not yet mentioned at http://PDFreaders.org
http://sf.net/projects/pdfcreator is a virtual printer that writes a pdf file.
http://Trac.Emma-Soft.com/epdfview >>ePDFView is a free lightweight PDF document viewer using Poppler and GTK+ libraries. The aim of ePDFView is to make a simple PDF document viewer, in the lines of Evince but without using the Gnome libraries.
http://GNUPDF.org >>The goal of the GNU PDF project is to develop and provide a free, high-quality, complete and portable set of libraries and programs to manage the PDF file format, and associated technologies.
http://Okular.KDE.org >>Okular combines the excellent functionalities of KPDF with the versatility of supporting different kind of documents, like PDF, Postscript, DjVu, CHM, and others.
http://PDFEdit.Petricek.net >>Free editor for manipulating PDF documents. GUI version + commandline interface.