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Review of Foxit Reader powered by the Slant community.
For Windows / Linux: http://www.foxitsoftware.com/Secure_PDF_Reader/
Unfortunately bundles toolbar software in the installer, so watch out for that, but otherwise solid, fast, and free. Can also install a PDF printer.
SpecsUpdate
LicenseProprietary
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Cons
Con Has ads
Ads are minor, but would no ads would be preferable.
Commonly Compared
Foxit Reader
vs