MNML is a brand new app by the indie developer, John Saddington, and he is actually one of the first interviews that I did on this site.  The app is based on his popular Desk app, but designed specifically for Here are a few screenshots from his release:

write, publish, share
Write. Publish. Share.
Compose with comfort
Save locally, or in the cloud

This app is a great way of bringing the simplicity of the Medium editor to your desktop, and the bonus is saving locally. The price is $29.99 which I admire since the App store has lately become a race to the bottom. If you want to find out more checkout the app in the App Store.