I've mentioned NotePlan before, the Markdown-notes-meets-calendar-meets-tasks app for Mac and iOS, but it's worth pointing out again. Eduard recently added text folding and hidden Markdown links, among other things. Check out [this YouTube video](https://www.youtube.com/watch?v=SKOrZ554Ag8&feature=youtu.be) for details, as well as a look at how he uses NotePlay for Zettelkasten.
