Foxit Reader is free (shareware version also available with some added feature), light weight Adobe Reader alternative, to read the PDF Documents ,notes, copy text, snap shot , creating a link within a PDF documents , markup tool, highlighting text available. The only annoyance the Adbar that appears on the upper right corner. By accidentally clicking it due to the placement of ad strategically just below close button , may have big annoyance as it will open up the home page of Foxit Reader in yours default browser.
Removing the Ad bar:
The Ad bar that appears on the upper right corner can be disabled by right-clicking on any Tool Bar and unchecked Advertisement. Remember, this option cannot be accessible through the menu bar. (Please observe the Screenshots)