That's probably a custom client for Campfire (right underneath the screenshot[1] they say it's Campfire).
[1]: http://zachholman.com/posts/github-communication/ (first screenshot)
Re:Update on Julie Horvath's Departure
by madeofpalk on Monday March 17, 2014 @09:25AM
(#7414854)
I was confused when I read the tweet after the article, but this seems like the most likely explanation
Re:Update on Julie Horvath's Departure
by steveklabnik on Monday March 17, 2014 @02:44AM
(#7413508)
At the same time: http://zachholman.com/posts/github-communication/
> We still use (and love) Campfire.
[1]: https://twitter.com/holman/status/444642237456998400