Chatty is a Gmail like instant chat application implemented in rails using private_pub gem for near-realtime instant chat. Checkout the tutorial on how to go about implementing it from scratch.
Great chat example!
Customize as need:
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add Foreman to manage servers
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seed {dev1, dev2, dev3, test1, test2, test3}@dev.com users
try at:
Feel free to clone the app, make improvements on it and submit a PR ;-)