https://github.com/jsbien/djvused4indexes
??? https://github.com/jsbien/early_fonts_inventory
https://github.com/jsbien/djview-poliqarp_fork
https://github.com/jsbien/Zaborowski-index4djview
https://github.com/jsbien/djview4isearch ???
https://github.com/jsbien/hocr2index
https://github.com/jsbien/cbdu-index4djvu
https://github.com/jsbien/rcin-index4djvu
https://github.com/jsbien/troc-index4djvu
https://github.com/jsbien/knapski-index4djvu