Windows only: Freeware application PDF-XChange Viewer is a quick PDF reader that lets you perform all kinds of useful PDF editing tasks. Among all of the features (and it is rich with them), PDF ...

Mozilla's latest version of Firefox conveniently includes a built-in PDF viewer. If you prefer your own PDF viewer, here's how to change it.

This well-designed and easy-to-use free PDF viewer lets you mark up and create PDFs. Adobe’s popular PDF format makes files look great and Adobe’s free Reader lets everyone look at the files ...

You can easily change the default PDF viewer on your Mac. The option to change your PDF viewer opens when you right-click a PDF and select "Get Info." ...

PDF Viewer adds document provider support too. Tapping the plus button in the document viewer lets you create a new blank document, folder, or open a PDF from iCloud Drive and any document provider ...

It has an impressively long list of features to make annotation easy. Got any other favorite PDF editor/viewer apps for Mac that you love? Share 'em in the comments.

Microsoft’s rolling out a new PDF viewer powered by Adobe Acrobat. While the tool will stay free, documents will feature Adobe branding and offer an option to pay for more “advanced” features.

I use PDF Exchange Viewer for opening pdf's. Problem in Firefox is that clicking a link that should open the pdf in the viewer returns an error message from the viewer software.