Couple of months ago I decided to substitute my OpenOffice for LibreOffice, it was my humble contribution to enforce LibreOffice since it seems to me a more free and open alternative, specially after Oracle’s movements.
By reading some blog (I don’t remember which one) I’ve found an interesting extension for OpenOffice (yes, I’ve wrotte OpenOffice). This extension converts to ePub any text document you writte down in your OpenOffice.
I’ve read the instructions about this Writer2ePub and I’ve followed it step by step but on my LibreOffice installation. Everything runs smoothly. It’s almost a “next-next-finish” installation.
So if you wan to convert easily your texts to ePub without additional software give a try to Writter2ePub, I’m going to do it. For sure you may use Calibre, but this, is added software to your computer.