Chattrr is a chat client that, when installed as a bookmarklet, brings up an area at the bottom of the current page where you can chat to others who are reading the same page. It runs on node and requires socket.io-node, redis (https://github.com/mranney/node_redis), express, hashlib, winston and underscore. It has been tested on firefox and chromium. Licensed under the GPL License: http://www.gnu.org/copyleft/gpl.html