Okular

Okular is a versatile document viewer for the KDE desktop environment. It is based on KPDF and is intended to replace it, as well as KGhostView, KFax, KFaxview, KDVI in KDE version 4, to achieve universal browsing in different formats. Allows to plug in additional modules, thereby expanding the list of supported file formats.

Okular supports the following file formats:

• PDF with Poppler;
• DjVu with DjVuLibre;
• PostScript with libgs;
• TIFF with LibTIFF;
• HTMLHelp (CHM) with libCHM;
• DVI (TeX);
• XPS;
• OpenDocument (ODF);
• FictionBook;
• ComicBook (e.g. CBR);
• Epub with ebook tools;
• JPEG, PNG, GIF, and several other bitmap formats.