Looks like 37signals is building a new editor called House (MD). The code is already available in the Writebook project which I haven’t tried yet.

This new editor is based on Markdown, which I like, since their current Trix editor is WYSIWYG, although it works pretty well in my experience.

Need to quickly learn or recall Markdown syntax? Our Markdown Dictionary is here to help. It’s a standard macOS dictionary built for the Dictionary app, so it’s compatible with iA Writer, iA Presenter, and other Mac apps too.