Whenever you think about PDF viewers, Adobe Acrobat is the one most likely to come to your mind. But that doesn't mean there aren't other choices.
Perfect PDF Reader is one of them. This lightweight PDF viewer enables you to open and review all your PDF documents in the same ribbon-style interface that appears in Microsoft Office.
The program features several viewing modes and also includes some tools to make PDF reading and managing even easier: bookmarks, text selection, image selection and a sidebar to browse through pages, among other things.
Perfect PDF Reader enables you to save PDF documents as plain text or images, and also send them by email right from the program. The program's name may be slightly misleading though, because Perfect PDF Reader is far from being perfect: there's no documentation, and you can't open more than one document at the same time.
If you're not happy with Adobe Acrobat Reader and want to try other alternative PDF viewers, give Perfect PDF Reader a chance.