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.
Sticky Notes - Sticky Notes is an integrated feature of adding notes in the Windows operating systems.
Mochi - Write notes and flashcards with Markdown and study them with spaced repetition.
Big Decisions - An app that helps you make better decisions
Markdown New Tab - Write notes in Markdown directly in the 'New Tab' page
StickyNoted - Sticky Note with Markdown flavour