I have been using this since the beginning for my open source project https://github.com/pksunkara/alpaca. They provide very good support. And the features are awesome.
Short story, Gitter is awesome!
Short story, Gitter is awesome!
In fact, Gitter uses Pavan's excellent Octonode library (https://github.com/pksunkara/octonode) for all it's communications with Github.