M
Mattermost
🗓 Est. 2015
Founded
2015
About
Mattermost is an open-source, self-hostable online chat service with file sharing, search, and third-party application integrations. It is designed as an internal chat for organisations and companies, and mostly markets itself as an open-source alternative to Slack and Microsoft Teams.
In The News
Mattermost: Open-source, on-premises, Slack alternative
Hacker News2015-06-24▲ 432 pts
Story of Mattermost: Open-Sourced Competitor to Slack
Hacker News2019-12-17▲ 395 pts
Mattermost restricted access to old messages after 10000 limit is reached
Hacker News2025-12-25▲ 385 pts
Mattermost 1.0 released – open-source Slack alternative
Hacker News2015-10-14▲ 332 pts
Open-Source Slack Alternative Mattermost Gets $50M Funding
Hacker News2019-07-08▲ 327 pts
Open Positions(3 roles)
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