Support DjVu, a PDF-like document format esp. suited for scanned documents
Name Category Description
apvlv app-text Alf's PDF/DJVU/EPUB Viewer like Vim
atril app-text Atril document viewer for MATE
evince app-text Simple document viewer for GNOME
geeqie media-gfx A lightweight GTK image viewer forked from GQview
imagemagick media-gfx A collection of tools and libraries for many image formats
okular kde-apps Universal document viewer based on KDE Frameworks
qpdfview app-text A tabbed document viewer
tea app-editors Small, lightweight Qt text editor
zathura-meta app-text Meta package for app-text/zathura plugins

Thank you!