This is a well-behaved what-you-see-is-what-you-mean editor based on contentEditable, with support for collaborative editing and (soon) customizable document models.

THIS CODE IS NOT CURRENTLY OPEN SOURCE (i.e. don't use it yet)

BUT WITH YOUR HELP, IT WILL BE: Take a look at my crowd-funding campaign at IndieGogo.

There isn't much documentation yet. You can read a bit more about the project, and see demos at the project page.

Here's a rough overview of the source directories (which may go out of date):

src/
  model/      The document model
  transform/  Operations on the document model
  edit/       The editor
  collab/     Collaborative editing module
  inputrules/ Magic input (-- → —) module
  convert/    Document conversion code to and from DOM, HTML, and Markdown
  menu/       Menu UI modules

To try the editor, run

npm install
npm run demo

And point your browser at /checkout/dir/demo/index.html