How about Discourse?

http://www.discourse.org/

"Discourse is the 100% open source discussion platform built for the
next decade of the Internet."

Here is the code:

https://github.com/discourse/discourse

Gordo


On 16/01/17 17:18, Edward Saperia wrote:
> The closest equivalent is IRC, I guess. However, it's a barrier to entry.
>
> See also http://xkcd.com/1782/
>
> *Edward Saperia*
> Founder Newspeak House <http://www.nwspk.com>
> email <mailto:edsaperia@gmail.com> • facebook
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>
> On 16 January 2017 at 17:13, Richard Nevell
> <richard.nevell@wikimedia.org.uk
> <mailto:richard.nevell@wikimedia.org.uk>> wrote:
>
>     Is there an open source version of slack?
>
>     On 16 January 2017 at 15:59, Gordon Joly <gordon.joly@pobox.com
>     <mailto:gordon.joly@pobox.com>> wrote:
>
>
>         >>Why are we not on an Open Source platform?<<
>
>         http://wikidevsuk.slack.com
>
>         I did ask this question a while back on SLACK....
>
>         Is there a good answer?
>
>         Gordo
>
>
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