Extension:TogetherJS

The TowTruck extensions enables real-time collaborative editing, both in the traditional wikitext edit box and with VisualEditor.

VisualEditor is not required, but you may wish to install it.

Download
TowTruck currently has dependencies on pre-release alpha versions of MediaWiki and VisualEditor (as of August 2013, 1.22wmf13); if you want to install it, you should shell into your server and use git to download the very latest version:

cd extensions git clone https://github.com/cscott/mediawiki-extensions-towtruck.git

Basic setup instructions
To experiment with this extension locally, add the following into LocalSettings.php:

Congratulations, you should now have TowTruck up and running! Test it by visiting a page like  on your wiki and clicking the "TowTruck" page action.