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Re:Mattermost: Open-source, on-premises, Slack alternative by it33 on Wednesday June 24, 2015 @08:19AM (#9771040)
Mattermost team here,

You guessed it, Mattermost is the 3rd version of what started as a portal/community site for our players (first version was forum-like, the second was Facebook-like, Mattermost is now HipChat/Slack-like).

Re:Mattermost: Open-source, on-premises, Slack alternative by javiercr on Wednesday June 24, 2015 @08:48AM (#9771147)
A blog post with that story would be interesting!