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Communication · free alternative

Mattermost

Self-hosted team chat with channels, calls, and integrations.

Licence
AGPL-3.0
Platforms
macos, windows, linux, ios, android, self-hosted
Self-hostable
Yes
Pricing model
open-core
Language
Go
Repo activity
Last release October 22, 2026
GitHub stars
39,437
Last verified
October 24, 2026

Replaces

The paid products this tool can replace, at their public list price.