Etherpad is a highly customizable Open Source online editor providing collaborative editing in really real-time.
http://etherpad.org
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Balloons.IO is a web multi-room chat server and client ready to use. It’s built with the help of node.JS, Express, Socket.IO and Redis. Balloons uses PassportJS for authentication with Twitter and Facebook
https://github.com/rickyrauch/Balloons.IO
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A free and open-source XMPP chat client in your browser
https://conversejs.org
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