MacDown - MacDown is an open source Markdown editor for OS X, released under the MIT License.
Medium - Welcome to Medium, a place to read, write, and interact with the stories that matter most to you.
Frost - An open API for Blockchain timestamping
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.
Typora - A minimal Markdown reading & writing app.
Analyze My Writing - Analyze My Writing is an online text content and readability analyzer.