Sumatra has built-in support for easy previewing of LaTeX documents. Support for CHM documents.
Support touch gestures, available on Windows 7 or later.
Open linked audio and video files in an external media player.
Improved support for PDF transparency groups.
This program received 6 awards
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4.5 MB
Free
I like it because of its portability.
Has worked flawlessly for many, many months since installed.