DjVu
DjVu is supported by a number of multi-format document viewers and e-book reader software on Linux ( Okular , Evince ) , Windows ( Okular , SumatraPDF ) , Android ( FBReader , EBookDroid , PocketBook ) . 
<triplet> Okular <subj> DjVu <obj> readable file format <triplet> Evince <subj> DjVu <obj> readable file format <triplet> Okular <subj> DjVu <obj> readable file format <triplet> SumatraPDF <subj> DjVu <obj> readable file format