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Re:Slack Is Raising $250M from SoftBank, Others by Mandatum on Thursday July 27, 2017 @09:36AM (#14865076)
Leading is a stretch, I've seen way more Mattermost and Rocket.Chat installations these past few months.

Mattermost is OSish, but Rocket.Chat seems to be a much more modern/UX friendly version compared to Zulip and fits the bill with FOSS.

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