[babby]

Another interesting library built for collaborative editing is Prosemirror. It's also in its infancy stages.

https://github.com/ProseMirror/prosemirror

It's by the guy who created CodeMirror and TernJS.

[sitkack]

Which is seeking funding to go open source https://www.indiegogo.com/projects/prosemirror/#/story

[marijn]

Here's a direct link to ProseMirror's collaborative editing demo http://prosemirror.net/demo_collab.html#edit-Example (which is up, and fast)

[babby]

I'm definitely excited for ProseMirror. If it's as quality as CodeMirror I'll be happily integrating it into everything I build!