Medium - Welcome to Medium, a place to read, write, and interact with the stories that matter most to you.
iA Writer - Minimal Design, Maximum Focus
Ghost - Ghost is a fully open source, adaptable platform for building and running a modern online publication. We power blogs, magazines and journalists from Zappos to Sky News.
MacDown - MacDown is an open source Markdown editor for OS X, released under the MIT License.
Typehut - Super simple publishing platform
MWeb - Pro Markdown writing, note taking and static blog generator