Markdown New Tab - Write notes in Markdown directly in the 'New Tab' page
Workona - A better way to work in the browser.
NotesHub - Fully cross-platform, markdown based note-taking app
Tab Manager Plus for Chrome - The only tab manager you'll ever need
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.
Toby - Better Than Bookmarks