Smart PDF Converter Pro is easy to use and extremely helpful.
It will let you convert your PDFs to several formats: HTML, DOC, RTF, XLS, JPEG, TIFF, and TXT.
All you need to do is to input your PDF, set an output format, an output folder and press Convert.
The software features an advanced settings menu from where you can choose different conversion methods.
After you convert and edit your PDFs you can easily convert them back to PDF format.
Read more here.