Mattermost

Open-source team messaging for school staff and classes

★ Stars39.4k39,379 on GitHub

Last committoday19 Oct 2026

LicenceAGPL-3.0Per the project

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From GitHub, fetched 19 Oct 2026.

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Mattermost is an open-source Slack-style messaging platform schools self-host for staff and class communication when they want an alternative to Remind or Discord.

Free alternative to

In collections

Details

Status	Open source
Licence	AGPL-3.0
Platforms	Web, Self-hosted
Category	Video, audio & feedback
Website	mattermost.com
Source	GitHub

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