Amanuensis - Another eBook creator tool from a odt (libre office) file. Ugly but free, fast and powerfull. Unfortunately my english skill prevent me to translate the manual in the stevenson language.
http://amanuensis.pagesperso-orange.fr/.
And for french user, the thread on Mobileread :
https://www.mobileread.com/forums/sho...d.php?t=140855