Up to now, Adobe Reader is most known no and not the most competitive of the readers PDF. Several programs appear also competitive and lighter than their precursor.
Pdf-Xchange Viewer is an application which allows to show documents PDF. It is not only lighter than Adobe, but he opens documents faster.
Furthermore you have the possibility of adding annotations and comments directly in the document.
Export more easily whole pages or whole file in formats pictures such as BMP, JPEG, TIFF, PNG and others.
Finally, PDF-XChange is played of every sort and kind of restrictions which prevent from filling forms or saving certain documents. You will also be able to write of the text in any document and export it in form of picture in numerous formats.