I recommend Boostnote.
Boostnote is an Open source note-taking app for programmers.
It have got over 4,400 stars at GitHub.
It focuses on writing Markdown note and code snippet quickly, can organized in a better way.
You can sync data to multi-devices(Mac, Windows, Linux, Android and iOS) via Dropbox.
This tutorial is more than six months old so questions are no longer supported at the moment for it. We will update it as soon as possible. Thank you! :]