llppac can auto-convert file formats for viewing in llpp.  The
following optional ports are required:

Port			Adds support for
------------------------------------------------------------
textproc/unoconv	Word and Libre/OpenOffice documents
graphics/djvulibre	DjVu
print/ghostscript9-base	PostScript and dvi files
graphics/librsvg2	SVG
x11-toolkits/pango	Fonts
graphics/imagemagick	Image formats besides PNG and JPEG
textproc/hs-pandoc	Text files

Auto-converted documents are cached in ~/.cache/llpp.