These are all free PDF converters:
Software Converters
Free PDF2Word Converter will convert PDFs to Word documents
IRFANView is an image viewer and converter. Download and install all of the plugins on the website.
doPDF converts in and out of a lot of different formats.
CoolPDF Reader will convert PDFs to images.
Online Converters
http://eic.heigh-tech.com/ Converts to Images.
http://www.freepdfconvert.com/ Convert to and from PDF, Word, Excel and PowerPoint
http://docupub.com/pdfconvert/ Converts anything to PDF or Images. It has Compression, Merge, and Resize too.
http://www.online-convert.com/ Converts everything. Audio, Video, Images, eBooks and more.