The closest equivalent is IRC, I guess. However, it's a barrier to entry.
See also
http://xkcd.com/1782/
*Edward Saperia*
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On 16 January 2017 at 17:13, Richard Nevell <richard.nevell(a)wikimedia.org.uk
wrote:
> Is there an open source version of slack?
>
> On 16 January 2017 at 15:59, Gordon Joly <gordon.joly(a)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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