Open source self hosted Slack.
https://mattermost.com
Content Management System
Get access to data on 32,844 websites that are Mattermost Customers. We know of 13,870 live websites using Mattermost and an additional 18,974 sites that used Mattermost historically and 4,000 websites in the United States.
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Get a list of 32,844 websites using Mattermost which includes location information, hosting data, contact details, 13,870 currently live websites and an additional 37,842 domains that redirect to sites in this list. 18,974 sites that used this technology previouslyand 4,000 websites in the United States currently using Mattermost.
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