[mjrpes]

Have you looked at Toast UI Editor (MIT license)?

https://ui.toast.com/tui-editor

I checked out a bunch of text editors on a past project and this one has worked very well as a WYSIWYG markdown editor.

[ssddanbrown]

Yeah, Got a list of potential options under review for our required criteria: https://github.com/BookStackApp/BookStack/issues/2738