MemPad
MemPad is a plain text outliner and note taking program with a structured index.
NimbleNotes
The digital notebook that helps you study.
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.
Inkdrop
The note-taking app with robust Markdown editor, supporting macOS, Windows, and Linux.
Leanote
Leanote provides services for note and blog.
Alternote
OS X note-taking app for Evernote.
