[WillAdams]

Arguably

https://play.google.com/store/apps/details?id=biz.bookdesign...

should ~~be~~ EDIT have been ENDEDIT opensource --- it does at least work to support Project Librivox (or at least that's my understanding)

Seems to no longer be available (see below)

[JSeiko]

I'm getting "We're sorry, the requested URL was not found on this server." if I go to the link

[WillAdams]

I believe the app is discontinued and the reason I can see the page is that I am on record as having downloaded it.