Convert/Export from Calibre as RTF, edit and import as DOCX and convert to epub works well.
I have multiple custom dictionaries for different projects. Also conversion between Word and LibreOffice dictionaries is very simple.
LibreOffice Writer: Free
Notepad++ (Windows) or KATE (Linux) for pure text with sessions, tabs and regex: Free
Sigil: Free
Calibre: Free
I've used various versions (bought) of Word for over 25 years but find LibreOffice Writer does what I want, though it's a little different. I edit only ODT files and Save As DOCX or DOC or RTF
I've used Sigil, but if the ebook is simple and styles are sensible in LO Writer, then DOCX to epub2 in Calibre works well. Then use the epub2 not DOCX for other format conversions.
Adobe Indesign seems ludicrously expensive and now you can only rent! I used to have Aldus programs before Adobe Borged them.
I've also used Google Docs. I'd regard it PURELY as a method to collaborate in real time and then EXPORT immediately. Similarly Office 365 is bonkers thing for a single user.
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