Mattermost 1.0
Open source Slack alternative
Mattermost 1.0 launched on October 14, 2015 with 219 votes, #95 of 4,175 launches that month and more than 95% of that year's launches. The site was still online in September 2026, 11 years on.
What it does
Alternative to proprietary SaaS messaging, Mattermost brings team communication into one place making it searchable and accessible anywhere. Written in Golang & React and run as a production-ready Linux binary under an MIT license with either MySQL or Postgres
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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