Typora - A minimal Markdown reading & writing app.
Write.md - Sharable, distraction free markdown editor.
StackEdit - Full-featured, open-source Markdown editor based on PageDown, the Markdown library used by Stack Overflow and the other Stack Exchange sites.
Moeditor - The all-purpose markdown editor built with Electron.
MarkText.app - Mark Text is a Markdown editor for Mac, Windows and Linux.
Inkdrop - The note-taking app with robust Markdown editor, supporting macOS, Windows, and Linux.