Mattermost
Open source, on-premises, Slack alternative
Mattermost launched on June 24, 2015 with 126 votes, #237 of 3,954 launches that month and more than 90% of that year's launches. The site was still online in September 2026, 11 years on.
What it does
Accelerate your mission critical workflow by integrating people, processes, tools and AI infrastructure on a resilient and adaptable platform.
Collaboration, automation and AI for air-gapped, on-prem and private cloud environments. Trusted by governments, enterprises and allied militaries. Deploy anywhere. Control everything. Too many enterprises struggle with fragmented communications, uncontrolled data exposure, and manual workflows that can’t keep pace. Mattermost delivers sovereign collaboration, adaptive security, and AI-accelerated workflows — purpose-built automation and controls to outpace complexity and win in any environment. Integrate and extend your collaboration environment to fit the tools you need to achieve the mission, from custom apps to industry standards. With deep integrations with mission-critical…from mattermost.com
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