System/Printing
freeware
PrimoPDF
PrimoPDF is a free PDF creator with no ads, no nagging, and simple to use interface and installer. Convert to PDF from any application by simply 'printing' to the PrimoPDF printer - it couldn't be easier. Within minutes, you can create high-quality PDFs by converting from Word, Excel, PowerPoint, and virtually any other printable file type.
freeware
Bullzip PDF Printer
Bullzip PDF Printer works as a Microsoft Windows printer and allows you to write PDF documents from virtually any Microsoft Windows application. It also allows you to write BMP, ESP, JPEG, PCX, PNG, PS, TIFF files.
freeware
doPDF
doPDF installs itself as a virtual printer driver so after a successful installation will appear in your Printers and Faxes list. To create PDF files, you just have to print your documents to the doPDF pdf converter. Open a document (with Microsoft Word, WordPad, NotePad or any other software), choose Print and select doPDF. It will ask you where to save the PDF file and when finished, the PDF file will be automatically opened in your default PDF viewer.
open source
PDFCreator
PDFCreator easily creates PDFs from any Windows program. Use it like a printer in Word, StarCalc or any other Windows application.