Mattermost

medium

Secure team messaging platform designed as a Slack alternative for organizations.

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

Many features require Enterprise license
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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