Tab Keeper - An extension to save all the tabs in a browser session
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.
Tab Manager Plus for Chrome - The only tab manager you'll ever need
Mochi - Write notes and flashcards with Markdown and study them with spaced repetition.
Tabbie - The missing tab manager for Chrome
Markdown New Tab - Write notes in Markdown directly in the 'New Tab' page