Notebook.ai - A smart notebook that grows and collaborates with you
NotePlan - Make plans inside an individual markdown note for every day in your calendar. Use it as a journal for your daily tasks and plan todos in advance. For Mac, iPhone and iPad.
Action Method Notebooks - Notebooks for making ideas happen
markdown to web - Convert markdown to online web page
Moleskine Smart Notebook - Turn hand-drawn sketches into fully workable vector files
Mochi - Write notes and flashcards with Markdown and study them with spaced repetition.