http://www.dopdf.com/

doPDF is a free PDF converter for both personal and commercial use. Using doPDF you can create PDF files by selecting the “Print” command from virtually any application. With one click you can convert your Microsoft Excel, Word or PowerPoint documents or your emails and favorite web sites to PDF files.

http://www.cogniview.com/cc-pdf-converter.php

The CC PDF converter (beta) is a free (open source) application that enables you to create PDF documents from almost any application (Word, Excel, Internet Explorer and more). The CC PDF Converter also allows you to easily embed a creative commons license in your PDF file.

http://www.primopdf.com/index.aspx