Evernote - Bring your life's work together in one digital workspace. Evernote is the place to collect inspirational ideas, write meaningful words, and move your important projects forward.

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.

Tyke - Mac menu bar app that @torrez really needed to take notes

Mochi - Write notes and flashcards with Markdown and study them with spaced repetition.

Thought Train - Stop using sticky notes to remember what you're doing 📒 🚫

Inkdrop - The note-taking app with robust Markdown editor, supporting macOS, Windows, and Linux.