Mattermost is in the Message Boards category. Mattermost is an open source Slack alternative. It's written in Golang and React and runs as a single Linux binary with MySQL or PostgreSQL. Use the features you like (file sharing, real-time group chat and webhooks—to name a few) and access the source code. See Mattermost vs. Slack
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Sample of 0 websites using Mattermost
No domain found or server error.
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