Dillinger - joemccann has 95 repositories available. Follow their code on GitHub.
Minimalist Markdown Editor - This is the simplest and slickest Markdown editor.
MWeb - Pro Markdown writing, note taking and static blog generator
Typora - A minimal Markdown reading & writing app.
Loose Leaves for Mac - Instantly share what you write in Markdown
Markdown by DaringFireball - Text-to-HTML conversion tool/syntax for web writers, by John Gruber