Mattermost

medium

Secure Slack-style team messaging platform with open-core self-hosted editions.

2 GB RAM Docker Active AGPL-3.0 iOS & Android

Source Docs Website

Replaces

Pros

Clean Slack-like interface
Good DevOps integrations
Strong security and compliance features
Excellent mobile apps

Cons

Free self-hosted edition has feature and history limits
Plugin ecosystem smaller than Slack
Can feel bloated for small teams
Frequent breaking changes in plugins

Tags

messaging team-chat slack-alternative devops

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