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https://mattermost.com/blog/on-premises-open-source-slack-alternative/
Open Source, On Prem, Slack Alternative - Mattermost
The genesis story of Mattermost. From YC backed video game company to open source slack alternative. Discover its origin story, mission, and vision.
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https://www.rocket.chat/alternatives/mattermost
Trusted Mattermost Alternative: Rocket.Chat | Sovereign & Secure
Advanced E2EE, sovereign AI, and Zero Trust security for defense and government teams. Deploy on-prem, air-gapped, or cloud. See why organizations choose...
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