Annotate PDF Documents
PDF-XChange Viewer enables you to annotate PDF documents. It allows a variety of operations, including highlighting, crossing or underlining text; drawing shapes; stamping and filling out PDF forms with a built-in typewriter; insert, edit or rename bookmarks. Unfortunately some advanced features are available only to the paid-for Pro version.
The good news is that now Foxit Reader has made this particular feature, together with most other basic annotating tools, available for free. If you’re looking for an alternative, Foxit Reader is definitely a good choice.