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Re:Slack raises $200M at $3.8B valuation for business messaging by vijayr on Friday April 01, 2016 @04:25PM (#11408278)
Is there a open source, self hosted product like Slack?

Edit: Never mind, others have already mentioned a couple, down the comments - for example, http://www.mattermost.org/

Re:Slack raises $200M at $3.8B valuation for business messaging by Shelnutt2 on Friday April 01, 2016 @07:02PM (#11409185)
We use http://rocket.chat . Its open source, offers a slack compatible api, multi-user video chatting, screen sharing and has mobile/desktop applications.
Re:Slack raises $200M at $3.8B valuation for business messaging by dberg on Friday April 01, 2016 @10:58PM (#11410021)
Has it been reliable ? We are testing with a few users but curious how it works at any kind of scale ?
Re:Slack raises $200M at $3.8B valuation for business messaging by mintplant on Friday April 01, 2016 @04:38PM (#11408403)
There's a deluge of them. Pick your poison:

http://alternativeto.net/software/slack/?license=opensource