This is great. Also see: <a href="https:&#x2F;&#x2F;zulip.org" rel="nofollow">https:&#x2F;&#x2F;zulip.org</a><p>And  the blog on why Dropbox decided to OSS it:<p><a href="https:&#x2F;&#x2F;blogs.dropbox.com&#x2F;tech&#x2F;2015&#x2F;09&#x2F;open-sourcing-zulip-a-dropbox-hack-week-project&#x2F;" rel="nofollow">https:&#x2F;&#x2F;blogs.dropbox.com&#x2F;tech&#x2F;2015&#x2F;09&#x2F;open-sourcing-zulip-a...</a>