PDFCreator converts every printable document to PDF and many other formats.

PDF Studio is a multi-platform PDF editor.

Foxit PhantomPDF provides you with a full suite of PDF viewing, sharing, and editing features.

Xodo is a PDF reader and annotator.

Free File Converter is an online web-based document to PDF converter software.

Nuance PaperPort is a document management software.

CutePDF Writer installs itself as a "printer subsystem". This enables virtually any Windows applications to convert to professional quality PDF documents.

qvPDF is a PDF creator for Windows. It's implemented as printer driver and uses plugins to execute different actions after creating the PDF.

Foxit PDF Creator is a PDF creator.

FreePDF is a PDF creator which can create PDF files via File, Print.

PDF Chain is a graphical user interface for the PDF Toolkit (pdftk).