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Re:Mattermost: Open-source, on-premises, Slack alternative by jmkni on Wednesday June 24, 2015 @09:03AM (#9771232)
I guess it's because it looks like a pretty easy application to build.

'Looks like' being key there.

Re:Mattermost: Open-source, on-premises, Slack alternative by gukov on Wednesday June 24, 2015 @01:06PM (#9772964)
Re:Mattermost: Open-source, on-premises, Slack alternative by amelius on Wednesday June 24, 2015 @02:24PM (#9773479)
Chat programs are the hello world programs of the era of the social web.