I’ve just released the first version of Versatil Markdown, a new Markdown editor/notebook application for OS X. And CommonMark compliant:
A hypernotebook built around Markdown/CommonMark, with 1Password integration, HTML/CSS support, syntax highlighting, frictionless keyboard flow, smart drag-n-drop insertion, multiple themes, document aliasing, and more.
Humble gratitude to the CommonMark community for their continuing effort in codifying Markdown.
If you’re interested in the app, you can find it at http://versatilapp.com