Okular

Okular is a universal document viewer based on KPDF for KDE 4.

The last stable release is Okular 0.10, shipped in the kdegraphics module of KDE SC 4.4.

Okular combines the excellent functionalities of KPDF with the versatility of supporting different kind of documents, like PDF, Postscript, DjVu, CHM, and others.
The document format handlers page has a chart describing in more detail the supported formats and the features supported in each of them.

http://okular.kde.org/

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