Typora - A minimal Markdown reading & writing app.
Markdown by DaringFireball - Text-to-HTML conversion tool/syntax for web writers, by John Gruber
Dillinger - joemccann has 95 repositories available. Follow their code on GitHub.
Minimalist Markdown Editor - This is the simplest and slickest 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.
MarkdownPad - MarkdownPad is a full-featured Markdown editor for Windows. Features: