If you are not already invested in WordStar and have an old DOS machine on hand, then I'd strongly suggest Emacs & Org Mode. The Emacs learning curve is pretty

If you are not already invested in WordStar and have an old DOS machine on hand, then I'd strongly suggest Emacs & Org Mode. The Emacs learning curve is pretty terrible, but once you are comfortable with Org you can do all your writing there. There's a huge benefit to having the same configuration for text editing (Sublime) and document preparation (Srivener, Word). Can't help with the fountain pen though. :)