Tree - Write documents in tree-like organisation with Markdown
Markdown New Tab - Write notes in Markdown directly in the 'New Tab' page
TabNotes - Markdown notepad in your new tab
NotesHub - Fully cross-platform, markdown based note-taking app
Array - "Need a multi-user database application? Code it with HTML/OS.
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.