A Web-hosted service that can convert a wide variety of documents, including WordPerfect, Word and other Microsoft Office, web pages, PostScript or most image formats, into Adobe PDF files. Free trial (first 5 conversions). http://createpdf.adobe.com/
Create a PDF from any Windows program. Use it like a printer in Word, Excel or any other Windows application. GNU General Public License (GPL). http://sourceforge.net/projects/pdfcreator/
Create PDF and convert anything printable to high-quality PDF documents with high printing resolution, copyright information, encryption, access control and fonts embedding. http://www.go2pdf.com
Software designed to create and edit PDF documents.(Windows 95, 98, 2000, 2003, ME, NT 4.0, and XP). Includes downloads, FAQ and upgrade information. http://www.pdf995.com/
Developers of ClibPDF,a library of ANSI C functions for creating files via C language programs without Acrobat tools, and TIFF2PDF, a command line program that converts TIFF files. http://www.fastio.com/