PDF-XChange Viewer (64-Bit)
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"Excellent freeware viewer and editor"
Pros
Viewer and editor which allows commenting, text insertion, sticky notes, shapes, etc. It also allows the user to insert links to pages, urls, or other files. While you can link to internal pages, you cannot create a bookmark in the free version. You can integrate it with your browser if desired. Some tools are available only in the paid Pro version but these features are clearly marked on the menu. I use the portable version on a USB stick and it is every bit as good.
Cons
On occasion, it locked up Firefox 12.0 so I am using it as a standalone viewer/editor. A few features are for the Pro version only but these are well marked.
Summary
An excellent alternative to Adobe Acrobat.