Side Sheep Viewer (net.sidebook.sidesheepviewer) on Google Play
This viewer is intended to view many kind of document file.In this version, this viewer can handle only pdf.You can open pdf files from SD card.Once you add documents in SD card to book shelf, this viewercan continue from the page which opened last time.Also you can take snapshot of a page and save it to special folder. The special folder can display those saved snap shot.