The threading model in Zulip is genius. It's the perfect marriage between instant messaging and email. Other things I like about it: - e-mail addresses in add

The threading model in Zulip is genius. It's the perfect marriage between instant messaging and email. Other things I like about it: - e-mail addresses in addition to nicknames - working full text search over everything - plenty of well thought out keyboard shortcuts - high quality production tooling (they even have Nagios checks, out of the box!)