The Microsoft XPS Document Writer saves your archived documents, Web pages and shared content as XPS files. Windows 8 includes an XPS Viewer that opens these files in a readable format.

Windows only: Free application STDU Viewer is an all-in-one tabbed reader for electronic documents, supporting everything from your standard PDF to the less common comic book archive (CBZ/CBR). It ...

is a lightweight, fast, document viewer. It contains no editing functionality, but does allow you to open, search, and copy text from a variety of common document formats, including .doc, .docx ...

With this handy extension, Google-built installed, Chrome automatically opens the file through the web-based Google Docs Viewer, which quickly renders documents directly in your browser.

Evince feature-list is short, but useful: View PDFs, view thumbnails, search, view document indexes, print documents, and encrypted document viewing. What more do you need from a PDF viewer?

Visualizer installs into Microsoft Windows with .NET support, and looks in documents for common legal styles to identify and report on defined terms.

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 ...