I&#x27;ve not used it myself (yet), but Prose Mirror (<a href="http:&#x2F;&#x2F;prosemirror.net&#x2F;" rel="nofollow">http:&#x2F;&#x2F;prosemirror.net&#x2F;</a>) is the one I have bookmarked and has been featured here on HN in the past and seems to be very full featured and from the demos it seems flexible everything from the full WYSIWYG-style editor that some users may want to this sort of simple toolbar over a Markdown field.